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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: 196,951
    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: 66,855
    09-30-2005, 09:44 AM Go to last post
  1. Normal Distribution Overlap

    Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

    Started by boilers38‎, 06-24-2010 01:44 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 28,315
    07-18-2017, 02:24 AM Go to last post
  2. Cool T-test versus ANOVA

    Hi all, I have two groups that I need to compare on several different dependent variables. I am wondering why I would choose to use a one-way...

    Started by nmrp‎, 05-05-2012 10:21 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 24,838
    03-06-2014, 03:03 PM Go to last post
  3. Test on expectation, when the variance is ignored

    We compute the estimator of the variance, s-square. My question is why we not use the value of the expectation in the null hypothesis to compute a...

    Started by klein‎, 11-23-2013 02:51 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 2,844
    11-27-2013, 12:29 PM Go to last post
  4. Hypothesis when seeking no differences

    Hi everyone, and thanks in advance for any help that is offered. I am working on my dissertation proposal and hit a bit of a wall when deciding...

    Started by ajr237‎, 03-11-2015 11:49 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,455
    03-17-2015, 03:00 PM Go to last post
  5. Normality Assumption for Independent t-test

    Hi All, This may be a fairly basic question but I am not the best at stats and so would very much appreciate your input. I wanted to get your...

    Started by bozatron‎, 01-12-2017 03:48 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,558
    01-14-2017, 01:09 AM Go to last post
  6. Bland-Altman plot interpretation

    Good afternoon, I am trying to compare humidity levels taken with our old hygrometers vs. our new one. I did some research over the internet,...

    Started by alexiab‎, 02-16-2017 09:06 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,060
    03-11-2017, 01:20 PM Go to last post
  7. hi~i come again~~this is a bout

    Case #1: Nutrition Education Programs Nutrition education programs, which teach their clients how to lose weight or reduce cholesterol levels...

    Started by daniel7lu‎, 11-25-2009 03:32 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,941
    12-02-2009, 08:29 PM Go to last post
  8. A question about determining significance

    Hi guys I'm trying to compare the differences in the results of a fitness test done by two different methods (and performed on a sample group of...

    Started by Sinkers‎, 05-07-2010 08:25 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 7,618
    05-12-2010, 03:10 AM Go to last post
  9. unbiased estimator for 1/p of geometric distribution

    Suppose X is a random variable with geometric distribution, and parameter p, 0<p<1, how do you find a statistc that is unbiased estimator of 1/p? Do...

    Started by colstat‎, 11-16-2010 11:55 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 19,218
    12-09-2012, 10:11 PM Go to last post
  10. 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: 41,414
    01-15-2014, 12:07 AM Go to last post
  11. Anyone great at Statistics and want to make $40 for about 30 mins. of your time?

    I'm conducting an online assessment. It's via a tutor website (USA based and well known) think artificial intelligence. I have a master account and...

    Started by StatsStudy‎, 07-01-2011 04:44 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,334
    07-03-2011, 12:33 AM Go to last post
  12. Reconcile ANOVA and Tukey significances

    My ANOVA (SPSS) of means over six years gives F(5, 364) 2.42 p = 0.035. A Tukey post hoc gives a lowest p = 0.094 between the first and last years...

    Started by ColinD‎, 08-07-2011 12:26 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,988
    08-08-2011, 10:28 PM Go to last post
  13. Calcualtion of % Change

    Hello, Let us say that we have the prices of x products in two different dates, say d1 and d2. I want to calculate the % change of all these...

    Started by zarasandreas‎, 09-06-2011 05:01 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,279
    09-15-2011, 07:29 PM Go to last post
  14. which optimal bin width formula to choose for histogram

    For histogram construction, I learned from that for Gaussian distributed samples, 3.49*sigma*N^(-1/3) is optimal as the bin width. However, for...

    Started by stony‎, 12-12-2011 09:14 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 22,376
    12-15-2011, 07:04 PM Go to last post
  15. Factos analysis on Likert Data

    I am trying to run a factor analysis on the results of 3 surveys. When I put in each survey individually, SPSS gives me a KMO number in the .6 to .7...

    Started by nigellscott‎, 02-20-2012 03:35 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,121
    02-28-2012, 02:53 PM Go to last post
  16. Statistics question - can somebody answer

    The Mensa Company designed two tests, Test 1 and Test 2 which both measure intelligence. The two tests are standardized and have the same...

    Started by statid‎, 04-20-2012 03:04 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,630
    04-27-2012, 01:53 PM Go to last post
  17. Should you transform skewed data when the distribution is expected?

    Hi all, I have been discussing this topic all week with people in my department and I can't seem to get a straight answer. I was taught long ago...

    Started by joemama224‎, 06-03-2012 06:55 PM
    2 Pages
    1 2
    distribution, skew, transformation
    • Replies: 16
    • Views: 17,449
    06-12-2013, 07:29 PM Go to last post
  18. preferred equation display

    I'm looking for people's opinions on the best way to present the same equation.Below are a series of differently formatted equations. Which equation...

    Started by trinker‎, 08-13-2012 08:57 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,197
    08-18-2012, 08:53 AM Go to last post
  19. how to calculate prevalance of obesity in spss using bmi values

    i am a newbie and i dont know how to calculate prevalance of obesity in spss using bmi values

    Started by arkabbot‎, 09-05-2012 12:09 PM
    2 Pages
    1 2
    prevalance, spss
    • Replies: 16
    • Views: 21,809
    09-09-2012, 11:35 AM Go to last post
  20. Likert scale data and regression

    First I know that in theory the independent variables don't assume any given distribution. But in fact that can't be true or you would use...

    Started by noetsi‎, 09-19-2012 09:05 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,432
    09-21-2012, 04:11 PM Go to last post
  21. Analysing Boxplots

    Hi all, I have created a bunch of boxplots with R, and was wondering if there is a good way to analyse them or the data statistically. All...

    Started by Bio90‎, 12-29-2012 03:46 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,388
    01-04-2013, 11:00 AM Go to last post
  22. Need to find a specific cut-off point (or maybe turning point)

    Is there an elegant way to find a specific patient age, after which there would be a significant decline in the incidence of a condition? I think it...

    Started by victorxstc‎, 04-09-2013 01:12 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,413
    04-19-2013, 02:56 AM Go to last post
  23. Test Statistic and P-value Calculation???

    A 1995 survey indicated that 7% of the adolescents in this age group had tried marijuana. Assuming 7% was the true value in 1995, you want to perform...

    Started by aweimer‎, 05-15-2013 04:40 PM
    2 Pages
    1 2
    p value, test question, test statistic
    • Replies: 16
    • Views: 3,901
    05-15-2013, 06:10 PM Go to last post
  24. looking for help statistics

    please help iv tried and dont know where to begin.

    Started by titanlord1‎, 02-04-2014 05:28 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,039
    02-10-2014, 08:44 PM Go to last post
  25. Constrain a value to be between -1 and 1

    I asked this question a while back and never found an answer. After reading my multilevel book I realized the answer from the logit link...

    Started by trinker‎, 04-12-2014 07:52 PM
    2 Pages
    1 2
    constrain, transform
    • Replies: 16
    • Views: 3,102
    04-13-2014, 11:57 PM Go to last post
  26. Significant p-value, but 95%CI includes 0

    Hello everyone, I have the following problem: The result of a Pearson correlation (sample size = 177) was significant, r = .127, p = .048...

    Started by grey‎, 06-11-2014 03:05 AM
    2 Pages
    1 2
    confidence interval, conflict, p-value, pearson correlation
    • Replies: 16
    • Views: 5,214
    06-12-2014, 03:05 PM Go to last post
  27. Hypothesis testing???

    Hi, I have a homework problem I need help with...if anyone could help or even point me in the direction of similar examples, I would be grateful! I...

    Started by tiffalala‎, 10-04-2014 12:30 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,197
    10-05-2014, 03:38 AM Go to last post
  28. Post-hoc after ANOVA < 0.05

    Working on tests for some survey questions for a dissertation. I am able to reject one Hypothesis with a 0.042 One way ANOVA. I have 5 groups in...

    Started by novadar‎, 12-15-2014 03:49 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,134
    12-23-2014, 06:49 PM Go to last post
  29. Calendar dates 'encrypted' in geometric calculations?

    This is no throwaway post and it basically targets people who are mathematically and philosophically (very) open minded. 2 geometric calculations...

    Started by coltfus‎, 10-21-2015 07:51 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 2,257
    10-27-2015, 11:43 PM Go to last post
  30. Cope with distributions that may take negative numbers

    Hi to everyone, I would like to know how to cope with distributions that may take negative numbers when it is physically impossible. For instance,...

    Started by davidvansan‎, 09-13-2016 04:48 PM
    2 Pages
    1 2
    non-negative, normal
    • Replies: 16
    • Views: 2,719
    09-15-2016, 09:27 AM Go to last post
  31. Computing Power

    I know that power is one minus beta...but how do you calculate beta?

    Started by amanning‎, 10-12-2005 09:48 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,277
    10-12-2005, 11:25 PM Go to last post
  32. introduction to stats

    i am a new student to statistics and was looking for some help. my question is. i have made a bar graph and then it asks what the main feature of...

    Started by sc111‎, 09-07-2008 10:45 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,519
    09-13-2008, 04:25 AM Go to last post
  33. standard deviation of multiple sample sets

    I'm trying to determine the standard deviation of multiple sample sets (measurements A, B, C taken on 3 different days), for which I know the means...

    Started by shoes‎, 02-07-2009 09:55 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 99,767
    09-07-2014, 01:28 AM Go to last post
  34. 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: 42,206
    03-05-2014, 04:12 PM Go to last post
  35. Arrow What is 'Significance F' and what is its forumula?

    My prof is giving us an ANOVA table to fill in with limited data and he pointed to significance f. I thought it was nothing or could find it on my...

    Started by sweetheart‎, 08-07-2010 05:39 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 60,228
    08-08-2010, 12:47 PM Go to last post
  36. which chart diagram is suitable for comparing M n F teeth crown length and root lengt

    I have data like this for 1st molar teeth gender CL RT ratio 1 7.45 12.84 1.723 1 7.46 ...

    Started by hikehub‎, 01-25-2011 05:26 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,453
    03-13-2011, 05:47 PM Go to last post
  37. t-test (beginner)

    Hey everyone, I'm trying to teach myself statistics for work. And I have the following question: Lets say that Im doing a paid search campaign...

    Started by moot‎, 03-16-2011 04:52 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,843
    03-18-2011, 01:47 PM Go to last post
  38. Two way repeated measures ANOVA and sphericity problems

    Very grateful for any kind of comments on this topic (i'm very confused): I've been running an experiment in which I've been treating the same...

    Started by kabooze‎, 08-02-2011 09:27 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,527
    08-11-2011, 12:49 AM Go to last post
  39. Least Squares method relating to an equation

    I have been given 5 sets of data each at different temperatures measuring stress vs time in each set. The question is:1) Using the data above,...

    Started by nicko999‎, 08-19-2011 07:29 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,341
    08-26-2011, 05:17 PM Go to last post
  40. Simple question about individual values being sig different from population mean.

    Hi I was wondering if someone could help. Say I have a sample of numbers 5,6,7,5,6,7,5,6,5,4 and I want to test which of these individual...

    Started by sammyj‎, 09-28-2011 05:19 AM
    2 Pages
    1 2
    significant, t-test
    • Replies: 15
    • Views: 4,811
    09-29-2011, 09:02 AM Go to last post
  41. using excel solver for linear programming ,desicion optimisation

    I have a statistice project on linear programming , desicion optimisation.Using excel solver.Have to find senstivity too.Can you tell me any easy way...

    Started by sia‎, 11-16-2011 08:09 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,017
    11-21-2011, 04:16 PM Go to last post
  42. standardizing a standard score?

    Is there anything wrong with standardizing a standardized score? I have some scorers and I first want to standardize their results by person. So...

    Started by trinker‎, 12-08-2011 10:47 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,677
    12-08-2011, 07:53 PM Go to last post
  43. 6 out of 6

    Anyone buy this argument? Thoughts? I'd like some way to write it up and this is my best shot .... A certain validation procedure requires a...

    Started by Philyuko‎, 01-30-2012 09:56 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,212
    02-02-2012, 01:04 AM Go to last post
  44. Test for normality

    HI, I have a question on my test of normality. I have 1 independant variables (type of maps) ..so if my data is normal, i should be conducting one...

    Started by lynnar‎, 02-22-2012 10:40 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,847
    03-09-2012, 03:13 AM Go to last post
  45. Question G*Power Sample Size Calculation

    Hi Everyone, First, let me say that I am thrilled to find this forum! It has been a while since I have taken Stats I and II, and I will be the...

    Started by LadyM‎, 07-11-2012 11:05 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 16,219
    07-16-2012, 03:59 PM Go to last post
  46. IRT question

    I am not sure item response theory is statistics as defined here or not:shakehead but I have a question to correct on my comps that I have been...

    Started by noetsi‎, 09-15-2012 03:32 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,141
    09-19-2012, 03:11 PM Go to last post
  47. Moe, Hannah, and Mathguy chatting it up

    Mittens suffers from Romnesia an average of 5 times per week. However, Joe Im just sayin Biden claims that Mittens rarely suffers from fewer than...

    Started by moe6142‎, 11-05-2012 01:41 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,898
    11-07-2012, 01:17 AM Go to last post
  48. Need some advice on normality and tests

    Hi, First I would like to thank you for this wonderful forum with lots of useful information :) I have two samples for which I'm trying to...

    Started by sika64‎, 11-20-2012 08:31 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,538
    11-21-2012, 02:32 PM Go to last post
  49. Confidence interval ratio/proportion?

    Hi, I'm having a question concerning a confidence interval for a percentage share and I would appreciate if someone could help me. I have data...

    Started by sternchen‎, 02-07-2013 08:43 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,204
    02-08-2013, 09:11 AM Go to last post
  50. Missing Data

    I am very new to statistics but I am looking for some common practice regarding this subject. I have entities which have an arrival time, but in...

    Started by hardy99‎, 04-17-2013 08:11 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,155
    04-18-2013, 11:36 AM Go to last post
  51. Upper level Stats course kicking my butt.

    I am having a lot of trouble in my stats class and can't afford to drop it. I am looking for a way to receive help online so my first problem I need...

    Started by FreakBoose‎, 09-16-2013 01:39 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,645
    09-17-2013, 07:59 PM Go to last post
  52. Binary mixed-model logistic regression using lmer() of lme4 for multilevel analysis

    In my experiment, each patient has been observed twice, once using placebo and the other time using the real treatment. I want to assess the...

    Started by victorxstc‎, 08-24-2013 04:56 PM
    2 Pages
    1 2
    generalized linear model, mixed effects model, mixed effects models, mixed model
    • Replies: 15
    • Views: 11,963
    08-27-2013, 04:07 PM Go to last post
  53. 2 samples t-test: normal or not?

    Hi. For a 2 sample t-test, where I'm checking the assumptions, I'm getting contradictory (at least to me) results regarding normality, between...

    Started by deltango‎, 01-24-2014 08:57 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,171
    07-16-2014, 09:47 PM Go to last post
  54. Is my solution correct?

    The mean amount purchased by a typical customer at The Effin Computer Store is $400 with a standard deviation of $28. Assuming a normal distribution,...

    Started by Lia1990‎, 06-26-2014 11:14 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,665
    06-27-2014, 01:00 PM Go to last post
  55. Same Constants when adding more dependent variables.

    Hi guys, First time poster here. I am working on my dissertation and I came up with some odd, although interesting, results. There are two...

    Started by emilpuiu1‎, 03-18-2015 07:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,414
    03-20-2015, 05:33 AM Go to last post
  56. Coefficient of Variation

    Hi all, Please bear with me as I'm not a good stats guy. If I have a dataset of groups of people's weights with SDs: Group 1: 78kg (5): COV...

    Started by Darkest Horse‎, 06-25-2015 11:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,774
    06-28-2015, 11:47 AM Go to last post
  57. Standard Deviation - Moving Range

    I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

    Started by Alinah‎, 07-09-2015 03:20 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,922
    07-15-2015, 03:04 PM Go to last post
  58. Is hierarchical multiple regression a form of multillevel regression?

    Is hierarchical multiple regression a form of multillevel regression? I've tried Googling it, searching on statistic books and I just can't seem to...

    Started by r4ch3l‎, 09-04-2015 04:50 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,822
    09-06-2015, 01:26 AM Go to last post
  59. Power calculation

    Hi Guys, really need your help please. My supervisor has advised that I perform a power calculation. I performed a re-audit ie in 2008/09 there...

    Started by skaur‎, 04-03-2016 11:40 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,059
    07-16-2016, 11:31 AM Go to last post
  60. Wilcoxon and Mann-Whitney Test

    Hello, I need to do one of these two statistical tests, I have a database on the consumption of fuel rods in each of the regions of my country,...

    Started by askazy‎, 12-11-2014 07:11 AM
    • Replies: 14
    • Views: 2,215
    12-12-2014, 01:21 PM Go to last post

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