1. Announcement:
    Want access to a chatbox?
    Dason ‎(Devorador de queso)
    05-10-2017
    Views:
    1,867
+ Post New Thread
Page 2 of 294 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 52 102 ... LastLast
Threads 61 to 120 of 17588

Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,871
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,817
    09-30-2005, 09:44 AM Go to last post
  1. Expected value of [random variable squared]

    Hi, I am looking for confirmation if my method is correct to find Expected value of . That is E Given that X is a normal random variable with...

    Started by PeterVincent‎, 10-04-2008 06:12 AM
    • Replies: 3
    • Views: 49,927
    10-05-2008, 11:48 AM Go to last post
  2. Exclamation Negative test statistic, what does it prove and what do i do with it?

    d) Perform a hypothesis test to see if the true mean time to accelerate from 0 to 100km/hr for eight-cylinder cars is less 14 seconds. In performing...

    Started by dreadfear‎, 10-10-2011 06:41 PM
    • Replies: 5
    • Views: 48,737
    01-09-2014, 08:07 PM Go to last post
  3. correlation between categorical and continuous variables

    Hello, I have a question regarding correlation between categorical and continuous variables. I know that I cannot use Pearson/Spearman to do this...

    Started by jaejae‎, 01-27-2012 02:38 AM
    • Replies: 3
    • Views: 47,722
    01-27-2012, 06:28 AM Go to last post
  4. Question K-S test interpretation in R

    Dear all I am doing a Kolmogorov-Smirnov test in R in order to test if the two variables are from the same distribution. Turns out that I don't...

    Started by pinto‎, 08-20-2010 06:58 AM
    • Replies: 3
    • Views: 46,577
    08-21-2010, 07:27 AM Go to last post
  5. Standard Error of the Residuals

    Hello, Iknow that the standard error of the residuals of a regression equation is given as the sqare root of SSE divided by the degrees of freedom...

    Started by zarasandreas‎, 12-28-2009 08:06 AM
    • Replies: 2
    • Views: 46,095
    12-03-2010, 01:36 AM Go to last post
  6. finding UMVUE of parameter 1/(1+λ)

    suppose X1,X2,X3 are a random sample of exponential distribution with parameter λ. how can i find UMVUE parameter 1/(1+λ). note: (T=∑Xi,(i=1,2,3);...

    Started by hadiSanji‎, 05-04-2012 10:11 AM
    statistics
    • Replies: 1
    • Views: 45,009
    05-04-2012, 11:24 AM Go to last post
  7. Hypothesis testing with no stated standard deviation

    My head is going to explode, can someone help before it is too late? Te problem: According to the government, 23% of all American adults have...

    Started by not a math genius‎, 02-25-2006 12:02 AM
    • Replies: 1
    • Views: 44,664
    02-25-2006, 08:35 AM Go to last post
  8. t-test and p-value from processed data (mean, SD, sample number)

    Hi all, I am new to this forum and would greatly appreciate your help. I know how to do a t-test for significance when I have simple sets of raw...

    Started by walfrieda‎, 06-12-2008 02:44 AM
    • Replies: 6
    • Views: 44,547
    02-03-2017, 07:17 AM Go to last post
  9. Post How to calculate the overall mean of several Likert scale data?

    Hi, I have a set of questionnaire as follow: Perceived Usefulness Rating(5-point Likert Scale) PU01 PU02 PU03 ... I used SPSS to compute...

    Started by wei6722‎, 03-01-2012 01:53 PM
    • Replies: 6
    • Views: 44,406
    03-05-2012, 06:45 PM Go to last post
  10. Outliers in a normal Distribution

    So far, all I've been able to figure out is the IQR in percentage is 50%. This is the problem. The percent of the observations that are...

    Started by DawnFang‎, 09-27-2008 05:05 PM
    • Replies: 5
    • Views: 44,380
    10-04-2008, 09:01 PM Go to last post
  11. finding UMVU estimator of θ^2

    suppose X_1,…,X_n be a random sample of distribution with probability density function f(x)=2/θ *x* exp(−(x^2)/θ),x>0. how can i find UMVU estimator...

    Started by hadiSanji‎, 05-03-2012 08:40 PM
    statistic
    • Replies: 1
    • Views: 43,634
    05-03-2012, 08:45 PM Go to last post
  12. What does an outlier in a stem and leaf plot look like?

    I have to analyze some displays (e.g. stem and leaf plot, histogram) I have generated for a homework questions from a group of numbers. I have...

    Started by alexis2‎, 12-12-2010 01:39 PM
    • Replies: 6
    • Views: 43,501
    12-12-2010, 04:06 PM Go to last post
  13. Confidence Interval- which is narrower? 95%? 99%?

    One of my homework question requires me to explain why 99% is narrower 95% but I think its other way around. Am I wrong or the question is a typo?

    Started by iamsevenup‎, 09-27-2008 08:44 PM
    • Replies: 2
    • Views: 43,307
    09-28-2008, 05:40 PM Go to last post
  14. Reliability (alpha and inter-item correlation)

    Hi I have just conducted the first stage of a test re-test of a scale that consists of 5 items. Where I got Cronbach's alpha of 0.71 This is...

    Started by Mohamed Afifi‎, 12-09-2011 04:29 PM
    • Replies: 5
    • Views: 43,079
    12-09-2011, 08:39 PM Go to last post
  15. Paired T Test Assumptions

    Hi, I'd be very grateful if someone could confirm my assumptions about the paired t-test below. I'm studying stats on my own so don't have a tutor...

    Started by Statstastic‎, 10-01-2009 06:14 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 42,187
    03-05-2014, 04:12 PM Go to last post
  16. Sufficient Statistic for θ

    Hey guys, So Im looking for a sufficient statistic for θ for U(θ, θ+1) Here's what I was thinking. T(X^n)=(min X_{i},max X_{i}) since the pdf is...

    Started by calculuskid1‎, 02-11-2013 09:59 PM
    • Replies: 11
    • Views: 42,145
    02-12-2013, 04:48 PM Go to last post
  17. p-value v sample size

    p-values & sample sizes in clinical trials Hi people, I have almost zero experience with biostatistics or statistics in general, but my boss has...

    Started by monosierra‎, 05-19-2011 01:17 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 41,931
    05-21-2011, 11:38 PM Go to last post
  18. finding z-statistic and P value

    Hello everyone! I just wanted to know if im doing this correct. The conclusion thing is quite confusing to me. I dont quite get how to find the level...

    Started by speth‎, 11-08-2006 11:15 PM
    • Replies: 2
    • Views: 41,872
    02-25-2010, 10:10 PM Go to last post
  19. How calculate intercept with multiple regression

    I am familiar with calculating the intercept, etc for a regression equation, but I am confused as to how to calculate the intercept when using...

    Started by joshuaAU‎, 06-30-2011 03:31 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 41,376
    01-15-2014, 12:07 AM Go to last post
  20. Help Required in calculating USL and LSL

    Hi all, I have a sample of 8 datapoints with a Std. Dev of 0.0195940953204932 and Mean of 0.10125 and Confidence Level(95%) value of...

    Started by ragav_in‎, 07-21-2008 09:16 AM
    • Replies: 3
    • Views: 41,190
    07-23-2008, 08:45 AM Go to last post
  21. why the sum of residuals must always equal zero?

    Hello, I was wondering why the sum of the residuals of a simple regression line must always equal zero. It simply blows my mind that it could...

    Started by MarginOfBuffett‎, 04-26-2011 10:49 PM
    • Replies: 3
    • Views: 40,560
    04-26-2011, 11:23 PM Go to last post
  22. Low correlation, but significative p-value

    Hello, I have a sample n=522, and did a spearman correlation with the result coeffeciente 0,27 **, wich indicates that there isnt a relation....

    Started by Caribu‎, 02-02-2011 07:21 AM
    correlation, p-value, zeros
    • Replies: 2
    • Views: 40,485
    02-02-2011, 08:03 AM Go to last post
  23. Scatterplots and Pearson’s r correlation coefficient? #12

    O.k. guys. I need a lot of help with these questions. This is a statistics equation that is kicking my butt, and I have no idea how to compute them....

    Started by Jennifer Grey‎, 08-09-2007 09:00 AM
    • Replies: 0
    • Views: 40,043
    08-09-2007, 09:00 AM Go to last post
  24. Question P value interpretation

    Hi , I am having a hard time understanding the concept of p value and also its interpretation. I know that I can interpret a p value of 0.80 as...

    Started by anushaka‎, 11-23-2011 08:24 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 39,246
    11-28-2011, 02:45 PM Go to last post
  25. not significant correlation...

    Hi there!!! I am wondering whether you can help me I am not familiar with statistics and I am trying to interpret the outcome of a bivariate...

    Started by ARI‎, 02-03-2011 12:19 AM
    • Replies: 6
    • Views: 38,743
    02-03-2011, 06:58 PM Go to last post
  26. Unhappy mean of means?

    Hello, I have run 3 repetitions of the same experiment. Each repetition has over 7000 samples but the number of samples in each repetition not...

    Started by pjl‎, 04-10-2010 11:45 AM
    • Replies: 2
    • Views: 38,449
    04-13-2010, 11:51 AM Go to last post
  27. Parsimonious regression model

    Hi, I am trying to finish an assignment and I am stumped on one question. It is asking me to build a valid parsimonious regression model. What do...

    Started by Sarah‎, 11-02-2005 05:46 AM
    • Replies: 1
    • Views: 38,336
    11-02-2005, 09:09 AM Go to last post
  28. Cronbach Alpha vs Pearson r

    Hi all, this might sound like a completely amateurish question but...what is the practical difference between cronbach's alpha and the Pearson...

    Started by dgi‎, 06-06-2012 05:13 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 38,028
    01-25-2015, 05:51 AM Go to last post
  29. increasing the r squared

    i have ran a regression with 4 varibles 1 being independent. my rsqaured is 0.25 is there anyway i can increase this or is there a better statistic...

    Started by diesel20056‎, 12-19-2011 12:56 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 37,634
    12-20-2011, 12:33 PM Go to last post
  30. moderator vs. mediator variable

    I've encountered these terms 100s of times and looked up their definition and tried to understand them at least 15 times. I'm really trying to get...

    Started by trinker‎, 09-04-2012 09:07 AM
    mediator, moderator
    • Replies: 13
    • Views: 37,086
    09-06-2012, 11:12 AM Go to last post
  31. Reasons for Z-Score standard deviation ≠ 1???

    I have a series of 24 raw scores which I have standardized by individually converting them to z-scores. My assignment asks me to calculate the mean...

    Started by rheighton‎, 05-08-2008 06:10 PM
    • Replies: 4
    • Views: 36,841
    05-09-2008, 04:12 PM Go to last post
  32. Question Standard deviation of the mean difference

    Hi, new to the forum, but if anyone can help out with the below query that would be brilliant! I am trying to calculate the Standard Deviation...

    Started by John Smith‎, 11-26-2008 12:56 AM
    • Replies: 1
    • Views: 36,773
    11-26-2008, 01:21 AM Go to last post
  33. Determing Z score from level of confidence

    How can I determine the Z score, given a level of confidence of 65%. My math book has the z score for .80, .90, .95, and .99 but none other. ...

    Started by nappyjim‎, 05-13-2006 07:11 PM
    • Replies: 1
    • Views: 36,762
    05-14-2006, 10:03 AM Go to last post
  34. Homework help - calculating ρ

    Hi everyone, I'm new to the forum and I would really appreciate some help with a homework problem. Sorry about possible language mistakes, my native...

    Started by NiklasWesterberg‎, 04-10-2011 09:27 AM
    homework help
    • Replies: 2
    • Views: 36,655
    04-10-2011, 02:47 PM Go to last post
  35. Talking How to interpret a standardized multiple regression coefficient

    How can I write an interpretation of the standardized multiple regression equation for both Age of Child and Number of Siblings in this model: ...

    Started by Alycat‎, 04-04-2013 06:44 AM
    coefficient, interpret, multiple, regression, standardized
    • Replies: 4
    • Views: 36,629
    04-05-2013, 09:34 PM Go to last post
  36. significant interaction but non significant simple effects?

    Hello everyone, I conducted a 2x2 mixed design ANOVA. The between subjects factor was group (high vs. low), and the within subjects factor was...

    Started by spiral‎, 09-25-2008 12:21 AM
    • Replies: 13
    • Views: 36,376
    05-03-2010, 08:27 AM Go to last post
  37. Variance of X squared

    I have a simple question, but very tricky... I have a random variable Z with: E= S var (Z)= sigma what is var(Z^2)? thanks

    Started by gigiola‎, 10-20-2010 05:03 AM
    • Replies: 5
    • Views: 36,365
    10-25-2010, 06:36 AM Go to last post
  38. Estimate of σ^2 (variance of Y in regression)

    Hello, everyone, I have a question about the regression. The textbook said, the mean-square regression term (SSY-SSE) provides an estimate of σ^2...

    Started by eugllena‎, 12-07-2012 11:12 AM
    • Replies: 0
    • Views: 36,122
    12-07-2012, 11:12 AM Go to last post
  39. need help with Case problem:Specialty Toys...pleasseeeee

    some1 posted this ? awhile back but never received replies so maybe some1 can help me....ANY help is highly appreciated..heres the problem: ...

    Started by paris playa69‎, 04-19-2008 07:11 PM
    • Replies: 5
    • Views: 35,994
    04-05-2011, 03:48 PM Go to last post
  40. Sample size calculation for study with 3 groups

    Hi, I need to calculate the sample size for a study comparing 3 groups. I have proportions for 2 of the groups (and can get the 3rd if needed)....

    Started by CharmSchool‎, 07-31-2009 04:30 PM
    • Replies: 1
    • Views: 35,951
    08-02-2009, 07:16 AM Go to last post
  41. Nonparametric multiple linear regression with SPSS

    Is there a way to conduct nonparametric multiple regression analysis using SPSS? If yes, can you provide some explanations on this regard. I...

    Started by Aldus‎, 04-29-2012 05:57 PM
    non parametric, non-parametric, nonparametric statistics
    • Replies: 3
    • Views: 35,558
    04-30-2012, 02:25 AM Go to last post
  42. Which to report with the median - the range or SD?

    I have data that is non-normally distributed and I'm writing up my results section. I am trying to figure out whether to include in a table the...

    Started by The Duke‎, 05-29-2009 04:17 PM
    • Replies: 3
    • Views: 35,461
    05-31-2009, 07:20 AM Go to last post
  43. median for grouped data

    Guys, that's the last question for tonight, I promise. How to calculate a median and quartiles for grouped data? I have found the following but not...

    Started by SylviaS‎, 11-02-2008 08:09 AM
    • Replies: 2
    • Views: 35,080
    11-02-2008, 10:28 AM Go to last post
  44. Mann–Whitney U tests around mean or median?

    Hello. So I helped run a fundraising event earlier this year that used an app, and we're now trying to measure if people the used the app...

    Started by wizuriel‎, 03-05-2013 09:40 AM
    • Replies: 4
    • Views: 34,980
    03-05-2013, 11:46 AM Go to last post
  45. 5% vs 10% significance level

    For hypothesis testing which one is considered stricter 5% significance level or 10% significance level. I know its a very basic question but it...

    Started by sak‎, 07-19-2012 05:00 PM
    significance level
    • Replies: 6
    • Views: 34,707
    07-21-2012, 03:13 PM Go to last post
  46. Scatterplots/ Pearson’s r correlation coefficient & coefficient of determination? #13

    O.k. guys. I need a lot of help with this question as well. This is another statistics equation that is kicking my butt, and I have no idea how to...

    Started by Jennifer Grey‎, 08-09-2007 09:18 AM
    • Replies: 1
    • Views: 34,553
    08-10-2007, 09:07 PM Go to last post
  47. Standard error - why sqrt of n?

    I happened to be browsing through some standard explanations of confidence intervals and came upon the formula for standard error... t x (stddev /...

    Started by jawon‎, 09-22-2008 03:03 PM
    • Replies: 8
    • Views: 34,224
    10-15-2008, 09:57 PM Go to last post
  48. Unhappy Comparing two percentages for significance

    Hello...this was posted but was lost recently. I am trying to figure out the best method to compare two percentages for significance. I am...

    Started by breiteyes55‎, 04-15-2007 11:06 PM
    • Replies: 1
    • Views: 34,177
    04-16-2007, 09:48 AM Go to last post
  49. Independent t-test p value 0.000? hmm

    What does a p value of 0.00 mean? I know below 0.05 shows significant difference at the 95% confidence level, but I think my teacher is testing us. ...

    Started by rtyrtyrtyus‎, 04-07-2009 07:11 AM
    • Replies: 5
    • Views: 34,137
    04-07-2009, 07:32 AM Go to last post
  50. Probability of correct answers on multiple choice test?

    I cannot figure out what formula to use for the following questions. If a student is taking a ten question (four answer choices per question) how do...

    Started by mcimo‎, 12-28-2008 12:01 PM
    • Replies: 1
    • Views: 33,839
    12-28-2008, 12:11 PM Go to last post
  51. Regression analysis with a proportion for the dependent variable

    Hi, i want to run a regression analysis for some data I have. The dependent variable is a proportion, and the independent variables are all...

    Started by Imicola‎, 02-06-2008 07:07 AM
    • Replies: 9
    • Views: 33,161
    04-30-2012, 04:05 AM Go to last post
  52. Comparing percentages

    I'm having trouble wrapping my head around some of this. I need to determine whether or not there is a statistical difference between two...

    Started by amperes‎, 03-28-2011 11:33 PM
    • Replies: 10
    • Views: 33,024
    10-11-2011, 03:31 PM Go to last post
  53. Spearman correlation & Bonferroni test‏

    Hello, I would like to ask your opinion about a stat test. I have computed a Spearman correlation between 13 variables (computing two variables at a...

    Started by satranq‎, 11-16-2012 06:20 AM
    • Replies: 1
    • Views: 32,788
    11-16-2012, 09:41 AM Go to last post
  54. Mauchly's test of Sphericity not defined. Why?

    Hello, With regard to Mauchly's test of Sphericity in order to assess validity of F statistic calculated for a one way repeated measures anova: ...

    Started by ozaz‎, 01-02-2009 05:13 PM
    • Replies: 9
    • Views: 32,636
    08-17-2009, 04:19 AM Go to last post
  55. How do you do an F-test for R-square

    Hi, How do you do an F-test to test significance of R-square in EXCEL? I have done a linear regression and get R-square = 0.412, how can I test if...

    Started by LizR‎, 01-17-2013 08:07 AM
    • Replies: 10
    • Views: 32,584
    01-23-2013, 08:58 AM Go to last post
  56. Arcsin transform

    Hello, I came across 2 different formulas for arcsin transformation of proportions (0-1) in excel: 1. =ASIN(SQRT(appropriate cell)) 2....

    Started by kasperski‎, 01-18-2011 05:29 PM
    • Replies: 3
    • Views: 32,229
    01-19-2011, 02:58 PM Go to last post
  57. Correlation with a nominal variable?

    Hello, I'm conducting a research project where I'm trying to find the correlation between the LSI-R total score (survey) and recidivism (if the...

    Started by laddergoat‎, 05-19-2010 11:08 AM
    • Replies: 14
    • Views: 32,218
    01-21-2015, 08:43 AM Go to last post
  58. logistic regression - very high Nagelkerke’s Pseudo-R2 values

    Hi all, I have a data set made of 12 years each one with a number of males and a number of females. I tested the relationship between the sex...

    Started by simone77‎, 09-17-2013 12:12 PM
    • Replies: 5
    • Views: 31,948
    09-18-2013, 04:15 PM Go to last post
  59. Comparing class grades across several courses – is ANOVA appropriate?

    Hi all, A group of ~20 students have taken a number of courses, some compulsory and others electives. I want to see whether there is a difference...

    Started by Arete‎, 04-26-2013 09:35 PM
    • Replies: 3
    • Views: 31,442
    04-28-2013, 07:02 PM Go to last post
  60. Comparing standard deviations of different means

    Hey y'all, I'm a total rookie when it comes to statistics, so please forgive my ignorance/laymen's terms. I want to know when CONSISTENCY is more...

    Started by cpaavola‎, 05-20-2011 06:24 PM
    • Replies: 4
    • Views: 31,413
    05-23-2011, 11:53 AM Go to last post

+ Post New Thread
Page 2 of 294 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 52 102 ... LastLast

Thread Display Options

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Order threads in...

Note: when sorting by date, 'descending order' will show the newest results first.

Icon Legend

Contains unread posts
Contains unread posts
Contains no unread posts
Contains no unread posts
More than 15 replies or 300 views
Hot thread with unread posts
More than 15 replies or 300 views
Hot thread with no unread posts
Closed Thread
Thread is closed
Thread Contains a Message Written By You
You have posted in this thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats