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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: 197,355
    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: 67,076
    09-30-2005, 09:44 AM Go to last post
  1. predicted value

    Find the best predicted value of y corresponding to the given value of x. Four pairs of data yeild r= 0.942 and regression equation y-hat = 3x....

    Started by hannao1‎, 04-21-2006 05:23 PM
    • Replies: 11
    • Views: 25,290
    12-20-2013, 03:14 AM Go to last post
  2. Statistics project: hypothesis testing

    For the most part i understand the concept but i am not sure what kind of test to use as my teacher only shows us how to do things in the calculator...

    Started by ckybam69‎, 04-22-2009 11:58 PM
    • Replies: 11
    • Views: 7,057
    07-13-2009, 06:54 PM Go to last post
  3. Question N vs N-1 in variance of population?

    I did not get the why there are N and N-1 while calculating population variance. When we use N and when we use N-1?

    Started by darkhorn‎, 11-03-2011 10:11 AM
    population, variance
    • Replies: 11
    • Views: 6,345
    11-03-2011, 03:09 PM Go to last post
  4. More determining sample size

    Hoping for some help and advice from statistical gurus.... Please forgive that this question has probably been asked a multitude of times...

    Started by shmeggeroni‎, 10-12-2009 03:49 PM
    • Replies: 11
    • Views: 5,515
    10-22-2009, 07:29 AM Go to last post
  5. Question What does the forumla Σ(x-xbar)/((n-1)v^(3/2)) calculate?

    What does the following formula calculate? Thanks

    Started by tuna‎, 11-14-2009 10:24 AM
    • Replies: 11
    • Views: 240,655
    11-15-2009, 03:25 PM Go to last post
  6. Which test/distribution to use for a a set of Randomly generated numbers?

    Hello I have generated random values but i am not sure if these data are trulty random or not. Which test should I use? A sample of 12 x 12 data...

    Started by Aharoun Baalan‎, 04-01-2010 01:24 PM
    • Replies: 11
    • Views: 5,859
    04-15-2010, 03:09 PM Go to last post
  7. variance estimation question

    Hi all. I am facing a problem to estimate the variance of a random variable. The difficult part is I am given a subset of the sample at one time. and...

    Started by brakepad‎, 04-13-2010 09:11 AM
    • Replies: 11
    • Views: 4,572
    04-13-2010, 07:27 PM Go to last post
  8. confidence interval vs hypothesis testing

    Hi guys, I have a little question, theoretical question. I read in a book that if I want to calculate a confidence interval for the mean, then I use...

    Started by WeeG‎, 06-14-2010 05:48 AM
    • Replies: 11
    • Views: 6,496
    06-15-2010, 04:27 PM Go to last post
  9. t- and F- values of correlation efficients

    What are the data sets that are used in finding t-value and F-value of correlation coefficients? If the correlation coefficient for X data set and Y...

    Started by Dr.Appalayya‎, 08-05-2010 06:24 AM
    • Replies: 11
    • Views: 9,045
    08-13-2010, 11:55 AM Go to last post
  10. Question Odds Ratio (with interactions in Logistics Regression)

    the following shows my logistics regression fitted model with interactions: p = 1/ (1+exp {-0.377 + 0.0933*x1 - 0.463*X2 + 0.0259*X3 +...

    Started by zellle‎, 08-11-2010 11:16 AM
    • Replies: 11
    • Views: 11,883
    08-16-2010, 11:09 AM Go to last post
  11. Angry Missing values

    On the basis of the partially completed contingency table below, select all the true statements from the following list: (note that the given...

    Started by SadieKhan‎, 09-04-2010 03:07 AM
    • Replies: 11
    • Views: 7,071
    09-05-2010, 04:08 PM Go to last post
  12. Central areas

    I'm so stuck on this question, its really starting to do my head in. I've listened to my recorded lectures on this topic about 8 times and gone over...

    Started by placid‎, 09-10-2010 07:15 PM
    • Replies: 11
    • Views: 2,853
    09-10-2010, 09:27 PM Go to last post
  13. Re:F-test for effect of two independent variable

    Anyone know how do we use a F-test to see if the impact of two independent variable are the same? e.g the impact of gender and the impact of race...

    Started by cmli4‎, 09-14-2010 05:41 AM
    • Replies: 11
    • Views: 7,402
    09-14-2010, 10:25 PM Go to last post
  14. Need Help with statistic question

    A computer password must contain exactly 6 symbols. You can use the letters (case sensitive), 10 digits, and the characters ! @ # $ %. Find...

    Started by davidmav19‎, 10-08-2010 02:02 PM
    • Replies: 11
    • Views: 5,224
    10-12-2010, 01:11 PM Go to last post
  15. Which test to use

    What test do I need to use if I want to find out if there is a relation between the place where somebody works and his opinion about economic issue....

    Started by AJB25‎, 10-18-2010 12:01 PM
    • Replies: 11
    • Views: 3,136
    10-26-2010, 12:51 PM Go to last post
  16. Question Error in parabolic regression of data points

    I have some data points, each with a specific (but different) error (standard deviation). I fit a parabolic curve to the data points using least...

    Started by strangersface‎, 11-03-2010 02:31 PM
    • Replies: 11
    • Views: 8,696
    11-03-2010, 10:57 PM Go to last post
  17. [HELP Self-learning] When use Z distribution and When T?

    I really think Stats is not for dump gal like me... Finally I get some questions to test my understanding. Can some gurus see if I applied Z / T...

    Started by dauphin‎, 11-04-2010 11:07 AM
    • Replies: 11
    • Views: 3,871
    11-04-2010, 07:30 PM Go to last post
  18. Difficulty understanding correlation results

    Good afternoon, I did a small study of 4 children (I couldn't find more subjects which met my independent variables in the time I had :/) and gave...

    Started by MathDummy‎, 12-04-2010 02:51 PM
    • Replies: 11
    • Views: 3,959
    12-05-2010, 08:56 PM Go to last post
  19. Help with Pearson Correlation - PLEASE

    I am still struggling with submitting my Thesis and Supervisor issues. I would appreciate some advice please. I have a sample size of 1089...

    Started by ppivec‎, 12-08-2010 07:54 AM
    • Replies: 11
    • Views: 13,817
    12-12-2010, 01:59 AM Go to last post
  20. Significance Test for Comparing two Proportions

    I need some help comparing two proportions. I am currently doing research on the inhibiton of a particular phenotype by various chemicals. The...

    Started by Hamiltop‎, 12-13-2010 12:39 PM
    • Replies: 11
    • Views: 7,067
    12-18-2010, 10:54 PM Go to last post
  21. How can I analyze data that is yes/no (I have it as 1/0)

    -Hi, I have a 2x2 factorial ANOVA design. It has several variables measured, but the only one I can't figure out is the one for specimen movement. ...

    Started by aesopclimber‎, 01-13-2011 01:50 AM
    • Replies: 11
    • Views: 22,857
    01-16-2011, 06:06 AM Go to last post
  22. If You're Good at Stats You'll Be Able to Solve This Problem

    Hey All, Will you help me with some combination/permutations problems? 1. A grocery chain wants to test a private-label cola drink. A tester is...

    Started by jimulin‎, 03-03-2011 03:09 PM
    • Replies: 11
    • Views: 3,489
    03-04-2011, 06:31 PM Go to last post
  23. Stats work: Distribution for a random variable

    Hey everybody, I've got a little statistics question that I'd really appreciate some help with. While carrying out a survey on the question "do...

    Started by Visa Electron‎, 03-17-2011 01:42 PM
    • Replies: 11
    • Views: 3,453
    03-22-2011, 05:26 PM Go to last post
  24. Confidence Interval One-tailed Test

    Hi, I'm working on a problem for work where a client of ours wants to analyze the use of mobile devices on which they deploy our software. They...

    Started by fretallack‎, 05-20-2011 01:30 PM
    • Replies: 11
    • Views: 11,418
    10-22-2013, 03:54 AM Go to last post
  25. correlation of 3 variables

    X is negative correlate with Y, and X is negative correlate with Z, the question is: is it possible that Y is negative correlate with Z? Give an...

    Started by pepsico007‎, 02-06-2013 10:10 AM
    • Replies: 11
    • Views: 2,859
    02-06-2013, 08:45 PM Go to last post
  26. interpreting SEM

    Hi, Was having a slight issue. while interpreting my SEM model results ...could you tell me how do i get 1.the beta coefficient and its...

    Started by Guria‎, 08-16-2011 04:42 AM
    • Replies: 11
    • Views: 5,903
    08-23-2011, 10:59 PM Go to last post
  27. I am stuck in this normal distribution statistics problem... please help...

    On an examination the average grade was 74 and the standard deviation was 7. If 12% of the class are given A's and the grades curved to follow a...

    Started by trialqw‎, 09-07-2011 10:32 AM
    • Replies: 11
    • Views: 3,177
    09-07-2011, 12:39 PM Go to last post
  28. Question poisson processes help

    Hi, i'm stuck on a basic poisson process question. If Xt (where t is a subscript) is a poisson process with intensity lambda what is the conditional...

    Started by mathy1991‎, 10-18-2011 10:25 AM
    homework help, poisson distribution
    • Replies: 11
    • Views: 5,066
    10-19-2011, 12:03 PM Go to last post
  29. Statistical test for animal arrival times

    What statistical test should I use for comparing arrival times at a location? I'm comparing two different search strategies.

    Started by Piz Palu‎, 11-16-2011 03:37 PM
    • Replies: 11
    • Views: 2,911
    11-18-2011, 11:29 AM Go to last post
  30. Type I/ Type II Errors

    Let X follow a Binomial distribution (5, theta) and consider the hypothesis H(0):theta<= 1/2 vs H(1): theta>1/2 Test A rejects the null...

    Started by Darktranquillity‎, 11-27-2011 04:03 PM
    • Replies: 11
    • Views: 3,691
    11-28-2011, 02:58 PM Go to last post
  31. relationship between category and dependent variables

    HI, I conducted a study on participants performance when using DEvice 1 or 2 (between subjects). Before that, they completed a learning style...

    Started by lynnar‎, 01-20-2012 07:07 PM
    • Replies: 11
    • Views: 1,543
    01-21-2012, 06:05 PM Go to last post
  32. Unhappy More than two values for a dummy variable (regression)?

    How do I deal with the case where I am dealing with more than two values for a dummy variable when doing regression? I know that if there are 2...

    Started by david_q‎, 01-28-2012 03:07 AM
    • Replies: 11
    • Views: 17,165
    01-31-2012, 02:16 PM Go to last post
  33. Statistical Preference - How to choose between two options with limited data?

    Assume I have two sets of samples and need to choose which is 'better' in a game theory sense. Of course I can just compare mean vs. mean but.. ...

    Started by StatsNewb‎, 01-30-2012 05:36 PM
    • Replies: 11
    • Views: 4,092
    02-14-2012, 04:12 PM Go to last post
  34. Maximum Likelihood Estimator for alpha in Gamma Distribution

    I got the first part of the question asking for the MLE for Beta. But I realized that MLE for alpha cannot be mathematically derived. I know that we...

    Started by yhalwani‎, 02-10-2012 01:38 AM
    • Replies: 11
    • Views: 8,196
    02-10-2012, 02:17 AM Go to last post
  35. At what value of correlation can I say two values are correlated? (academic ref)

    So I'm doing some regression tests but before I do the regression tests I am performing correlation analysis and removing variables that are very...

    Started by david_q‎, 02-19-2012 05:06 PM
    • Replies: 11
    • Views: 3,692
    02-20-2012, 07:46 AM Go to last post
  36. Probability to partake in either of two activities

    Hello! I am facing the following problem. I am trying to determine which one two activities gets preferred by the participants. I have lain out...

    Started by antologic‎, 03-14-2012 02:44 AM
    • Replies: 11
    • Views: 3,272
    04-03-2012, 03:41 AM Go to last post
  37. Traffic Problem

    Well they went and did it! They installed a stop sign on our road because a the folks on a small Feeder road were worried about safely entering the...

    Started by Broccolib‎, 03-19-2012 07:00 PM
    traffic problem
    • Replies: 11
    • Views: 2,558
    03-20-2012, 11:56 PM Go to last post
  38. Do minimum/maximum ends of the range of IV affect the turning point location?

    Hi all Is turning point independent of the minimum and maximum points of the curve? or if we extend the minimum end to lower thresholds, there...

    Started by victorxstc‎, 04-12-2012 05:28 AM
    • Replies: 11
    • Views: 4,944
    05-10-2012, 07:00 PM Go to last post
  39. One level of dichtomous variable missing when mutlivariable analysis conducted

    Hello, I would appreciate any help on this. I am running a mixed model procedure as part of my mutlivariable analysis. My dependent variable...

    Started by Jainie‎, 08-08-2012 11:43 AM
    • Replies: 11
    • Views: 2,376
    08-09-2012, 06:40 AM Go to last post
  40. Which test to use - correlation or differencies in biology?

    Hello! First question here, hope someone of you can give me a helping hand. Me and a friend have performed a basic study on peregrine...

    Started by Joachim‎, 08-15-2012 05:26 AM
    • Replies: 11
    • Views: 2,423
    08-15-2012, 01:57 PM Go to last post
  41. How to treat multiple responses to a single response survey question

    Hello all, My department is running a longitudinal study, where surveys are filled out by participants at various time points. The participant...

    Started by MFWolverine‎, 08-15-2012 09:59 AM
    • Replies: 11
    • Views: 4,333
    08-15-2012, 03:12 PM Go to last post
  42. Friedmans Test HELP please

    Not homework (research data) I am confused over using the Friedman's test. Should the friedman's test be used for the same question ? or should it...

    Started by lmay0001‎, 08-22-2012 06:26 PM
    • Replies: 11
    • Views: 1,905
    08-25-2012, 07:01 PM Go to last post
  43. Appropriate to use time as covariable in ANCOVA?

    Hello stats people, I need to assess whether the rate of increase (in soil carbon) differs significantly between two groups (forests). I believe...

    Started by aibing‎, 09-26-2012 10:33 PM
    ancova
    • Replies: 11
    • Views: 2,925
    09-30-2012, 10:50 PM Go to last post
  44. Kruskal Wallis and Mood's median

    Would appreciate some perspective on the following: Is the Mood's median test now rarely used? I am comparing right-skewed distributions (3...

    Started by StatsClue‎, 11-02-2012 03:25 AM
    • Replies: 11
    • Views: 6,444
    12-03-2012, 03:04 AM Go to last post
  45. Who is more likely to win (mean score + standard deviation)

    My teacher gave this as an example: "Scotland is going to play vs Tonga in rugby. Tonga has a mean score of 18 and a standard deviation of 13....

    Started by GardR‎, 10-18-2012 07:52 AM
    • Replies: 11
    • Views: 2,753
    10-18-2012, 02:09 PM Go to last post
  46. Hypothesis Testing Question Help

    I've been lurking for some time now, soaking up knowledge, but now I'm stuck on finding p-values for the following question. Q: A board game...

    Started by zigzager‎, 11-18-2012 03:18 AM
    • Replies: 11
    • Views: 2,886
    11-20-2012, 04:37 PM Go to last post
  47. Help needed with cotton experiment

    Hello all! First time visitor/poster. . . I am needing your help with determining the statistical significance of a cotton variety trial that I...

    Started by bryan‎, 12-04-2012 06:16 PM
    • Replies: 11
    • Views: 1,549
    12-06-2012, 02:20 AM Go to last post
  48. Testing for similarity vs dissimilarity

    Hi all, I'm a grad student who uses stats a lot but who has very little formal training. Not sure if this is in the right forum, so feel free to...

    Started by Qroid_mtl‎, 11-20-2012 02:49 PM
    • Replies: 11
    • Views: 3,386
    11-21-2012, 08:37 AM Go to last post
  49. Unhappy 15 Likert scale questions: How do I find the mean, median and mode?

    Please Help! I need to find the mean the median and the mode and also use a t test to interpret my results between females and males in mate...

    Started by cardo‎, 12-17-2012 04:38 PM
    • Replies: 11
    • Views: 14,529
    12-18-2012, 03:03 AM Go to last post
  50. Regression Question

    Hey guys, stuck on a homework question, help please! Country/per capita expenditure/% of Health costs paid by private insurance Japan/2662/0.4...

    Started by HopeLessStats‎, 04-16-2013 01:03 PM
    • Replies: 11
    • Views: 1,769
    04-18-2013, 01:18 AM Go to last post
  51. Best way to determine if replication helped

    I am trying to figure out a way to help show me that having two reps in an experiment is better than one rep. I remember doing a blocking efficiency...

    Started by gradIIndy‎, 02-09-2013 11:07 PM
    • Replies: 11
    • Views: 1,780
    02-12-2013, 08:35 PM Go to last post
  52. How to Calculate p-value of Grade Averages

    I have average test scores for two populations: male and female. The average score for females is 92. The average score for males is 89. Given...

    Started by alpinegroove‎, 03-01-2013 08:50 PM
    • Replies: 11
    • Views: 5,255
    07-05-2013, 03:05 PM Go to last post
  53. 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: 42,253
    02-12-2013, 04:48 PM Go to last post
  54. Consistent MLE of a U(0, θ)

    So the question is: Let X1,.., Xn ∼ U(0, θ). Show that the MLE is consistent. Hint: Let Y=max {X1,... ,Xn}, for any c, P(Y <c)=P(X1 <c,X2...

    Started by calculuskid1‎, 02-09-2013 04:19 PM
    • Replies: 11
    • Views: 58,521
    02-09-2013, 09:14 PM Go to last post
  55. Using regression to find "balance" (Making a video game. :))

    Hello everyone. I'll try to be brief. The first paragraph or so may be irrelevant to answer the question, but I'm including it for context. For...

    Started by McGuirk‎, 04-10-2013 09:20 PM
    • Replies: 11
    • Views: 2,232
    04-16-2013, 12:49 PM Go to last post
  56. T-test

    I'm carrying out a t-test 'by hand' in R. H0: mean = 0, H1: mean != 0. Sample is 9, 10, 11, 10, 10. Sample mean is 10, with standard...

    Started by Layo909‎, 05-04-2013 03:46 AM
    • Replies: 11
    • Views: 2,123
    05-04-2013, 09:19 PM Go to last post
  57. Red face A causes B - B causes C - Does A cause C?

    Hi all! I have a simple problem with my two hypotheses: H1: Industry dynamic (A) positively influences competence (B). H2: Competence (B)...

    Started by GabrielBox‎, 07-16-2013 02:37 PM
    • Replies: 11
    • Views: 4,728
    07-19-2013, 06:28 PM Go to last post
  58. Discrepancy between paired t-test and independent t-test results

    Hi, I'm analysing pre- and post- data collected from two groups. Group 1 consists of 18 members who received treatment. Group 2 consists of...

    Started by cheekychica‎, 07-31-2013 10:36 AM
    • Replies: 11
    • Views: 3,587
    08-05-2013, 11:15 AM Go to last post
  59. Lightbulb One-way ANOVA or two-way ANOVA?

    Supposed we gave 100 males and 100 females protein supplement for 3 months. We measured the muscle thickness of the participants before and after the...

    Started by vivian88‎, 08-18-2013 06:30 AM
    anova
    • Replies: 11
    • Views: 2,520
    08-20-2013, 08:11 AM Go to last post
  60. [help] regression hypothesis model help needed

    thank you so much everyone i solve this question :) now not sure its completly solved but i solved it by my self thank s again to all

    Started by numerospy‎, 11-12-2013 10:39 PM
    • Replies: 11
    • Views: 1,905
    11-14-2013, 06:47 PM Go to last post

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