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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 197,237
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 67,003
09-30-2005, 09:44 AM
1. ### Paired T Test or One Way ANVOA

Hi, I'm trying to analyse data from a small sample size (10 people) but not sure which test I should use. my data is based on having asked the...

• Replies: 1
• Views: 870
04-02-2014, 03:41 PM
2. ### Zero confidence in stats!

Studying for exam in SPSS now and i have just lost all confidence in stats. The question is " compare the rates of microalbuminuria at 4 years in...

• Replies: 3
• Views: 1,830
04-02-2014, 10:25 AM
3. ### New to stats, need help

A random sample of 15 hourly wage of waiters was drawn from a normal population. The same mean and sample standard deviation were x=149 and s=6.75....

• Replies: 1
• Views: 1,295
04-02-2014, 07:54 AM
4. ### Re: Adjustment for multiple comparisons

Hello ! Here is my problem. I am calculating the correlations between two sets of data from the same samples (relative abundance of bacteria vs...

• Replies: 0
• Views: 947
04-02-2014, 03:44 AM
5. ### Estimating Closing Pirce with 95% Confidence on Excel

On March 10 2014, S&P Index stood at 1841.13 and Johnson & Johnson was at 92.81. The next week on March 17, 2014 S&P 500 stood at 1866.52. Estimate...

• Replies: 1
• Views: 1,023
04-01-2014, 08:58 PM
6. ### Interaction Effects

Suppose I have a data set with Two Factors: F1 - 3 Levels; F2 - 4 Levels We attempted to perform 3 reps for each combination, but were unable to...

• Replies: 0
• Views: 1,053
04-01-2014, 06:22 PM
7. ### Type 1 error - any help appreciated

Hey guys, i'm new here but have a feeling i'll be sticking around for quite a while ... Basically i have a question regarding type 1 error. I've...

• Replies: 4
• Views: 1,963
04-01-2014, 06:15 PM
8. ### Std error of the estimate!

Basically my question is "in an analysis, if you fitted two models with very different values of R-squared. would you expect the Std. error of the...

• Replies: 4
• Views: 1,561
04-01-2014, 04:18 PM
9. ### Confounding vs. Extraneous Variables?

I need to know the difference between these two in a psychological research paper I am studying, in which there are two levels of independent...

• Replies: 3
• Views: 2,557
04-01-2014, 03:09 PM
10. ### Need Help with finding out influence of value on total

Hi I am new here and trying to learn statistics (again?). So i guess I am going to ask some stupid questions :). Here is my 1st one I have a data...

• Replies: 1
• Views: 1,346
04-01-2014, 02:47 PM
11. ### How does age/sex influence a repeated measure variable (lab results)?

I'm having huge trouble finding the right statistical test for the job. I want to check if age, sex, duration of illness etc. has an influence on...

• Replies: 0
• Views: 893
04-01-2014, 02:03 PM
12. ### Candidate selection help to find fairest mechanism to use

Hello all, Seeking some guidance to help me as I work out the score of a group of candidates for a set of roles I am hiring for. They've had to...

• Replies: 0
• Views: 970
04-01-2014, 11:46 AM
13. ### Interpreting Wilcoxon-signed rank results question

Hello all, I am struggling to understand and interpret the Wilcoxon-signed rank test data on my (girlfriend's) assignment, if someone could clear...

• Replies: 5
• Views: 2,354
04-01-2014, 08:24 AM
14. ### Equality of variances in SPSS

Can we not perform a normal F test for homogenity of variances in SPSS? Is Levene's test the only way?

• Replies: 0
• Views: 999
04-01-2014, 12:49 AM
15. ### normal distribution help

Reports that the height for the population of adult men is normally distributed with a mean of 69.5” with a standard deviation of 2.4”; for the...

• Replies: 1
• Views: 3,850
03-31-2014, 04:03 PM
16. ### Normal Distribution question

Assume a beverage filling company is supposed to fill beer bottles with 330ml beer. The machine can be adjusted to any filling volume with a...

• Replies: 0
• Views: 972
03-31-2014, 11:01 AM
17. ### how do i approach this problem?

how do i approach this problem? thanks in advance.

• Replies: 23
• Views: 3,757
03-31-2014, 08:37 AM
18. ### a question in uniform distribution

suppose X1,…,Xn be random sample of U(0,θ) distribution. if X(n) be largest order statistics of sample, and V=nX¯/X(n), how can I calculate...

• Replies: 1
• Views: 1,641
03-30-2014, 11:15 PM
19. ### Help Me Pretty PEAS!!

Hello big boys and girls! Got a killer assignment this week! I'm a full grown engineer but don't know any stats! :shakehead Myself and some...

• Replies: 3
• Views: 1,536
03-30-2014, 04:57 PM
20. ### anyone know how to do this? im stumped.

• Replies: 7
• Views: 1,630
03-30-2014, 10:44 AM
21. ### Main Effects & Interaction Effects

I have 3 factors: F1 = 2 Fixed levels; F2 = 2 Fixed Levels; F3 = 2 Fixed Levels. I am given the pouplation means, not sample means, for all...

• Replies: 2
• Views: 1,007
03-30-2014, 01:52 AM
22. ### 95% Confidence Intervals

Hey, I've been searching the web frantically for the last hour trying to find out how you calculate the 95% CI for a 2x2 Within Group ANOVA and a...

• Replies: 2
• Views: 1,246
03-29-2014, 06:59 PM
23. ### Which Statistical Test to Use?

I am doing a research project in which I have collected variables on two separate groups. One group uses a self testing laboratory machine which I...

• Replies: 0
• Views: 862
03-29-2014, 04:56 PM
24. ### Bayes Probability.

The probability that an insured individual will give rise to no claims next year is e^-θ, where θ varies by individuals according to the density...

• Replies: 4
• Views: 1,706
BGM
03-29-2014, 02:56 PM
25. ### Change scores that influence each other, how to tell what's going on?

Hi I had a question about comparing change scores. My study includes a stressor, So I have Timepoint 1 (baseline) TP2 (Stress Response ) and TP3...

• Replies: 0
• Views: 1,049
03-29-2014, 01:56 PM
26. ### R Kolmogorov-Smirnov test

Hi, I'm a little confused about this output of a ks.test in R: > ks.test( scale( runif(30)), "pnorm") One-sample Kolmogorov-Smirnov test ...

• Replies: 4
• Views: 2,447
03-29-2014, 01:03 PM
27. ### Assigning numerical ranks to ordinal question categories for analysis purposes

Hello all, I am working on a dissertation on parent involvement types. My data is derived from a self-administered survey. I wrote responses to...

• Replies: 0
• Views: 1,342
03-29-2014, 09:42 AM
28. ### using descriptive statistics for very large performance analysis

Supervisors grades the performance of our international associates every year (located in twelve countries), in scores from 0 to 5. The means for the...

• Replies: 4
• Views: 1,099
03-29-2014, 07:16 AM
29. ### Regression Analysis with Time Series Data

Hey guys, I have some monthly time series data and I'm trying to perform regression analysis on it. I'm just wondering, if I have a few insignificant...

• Replies: 1
• Views: 1,377
03-28-2014, 04:12 PM
30. ### Hypothesis Test - is this correct?

Im trying to do a hypothesis test for whether our sample has an SAT average of 1200 or higher: Use µ to represent the true mean SAT score of our...

• Replies: 1
• Views: 919
03-28-2014, 03:17 PM
31. ### Statistic Test...Likert Scales?

Hi guys, I don't have much experience crunching data on Likert or Likert Type scales. For this question, I have to look at individuals with a...

• Replies: 0
• Views: 1,230
03-28-2014, 12:32 PM
32. ### Question on Data Transformation

Greetings all! I have 3-predictor variables, say x,y and z. Using Shapiro-Wilk, I find that x and y are not normal and z is pretty normal. I...

• Replies: 0
• Views: 741
03-28-2014, 09:55 AM
33. ### What test to determine if 5 years of population data has a trend?

Hello. I have population data for 5 years for several species of birds and I would like to know whether the populations are growing, staying...

• Replies: 1
• Views: 1,222
03-28-2014, 07:52 AM
34. ### Solving a permutations-combinations problem

Hi Could you please explain to me how to do the following question? "There are 12 beads in an urn, where 5 of them are blue, 4 are red and 3 are...

• Replies: 3
• Views: 1,812
BGM
03-28-2014, 06:02 AM
35. ### APA reporting single main effects

Hi, thank you in advance for your help! I performed a repeat measures ANOVA on my data; the interaction was significant so I performed a single...

• Replies: 0
• Views: 1,549
03-28-2014, 05:23 AM
36. ### Mean split vs. median split

Hi, Could anyone please explain to me what the exact difference between Mean split and median split? And which one much recommended? Many...

• Replies: 6
• Views: 9,891
03-27-2014, 03:57 PM
37. ### What to do with missings?

I am computing a scale 'political participation' out of 7 questions that measure political paritcipation. For example: I voted in the last elections...

• Replies: 1
• Views: 1,387
03-27-2014, 12:34 PM
38. ### Not randomized sampling

Hello all, I want to make a small research. I want to compare the price of gluten free food products to similar "regular" products. The thing I...

• Replies: 5
• Views: 1,680
03-27-2014, 12:03 PM
39. ### Multinomial logistic regression categorial scale question

I have data about political participation where respondents answers questions 7 (yes or no) that indicate some form of political participation. for...

• Replies: 1
• Views: 889
03-27-2014, 05:30 AM
40. ### How to calculate max/min scales on a scatter plot

Good morning! I have 3 log scatter plots that I want to establish smooth maximum and minimum lines. What is the usual mathematical method to do...

• Replies: 1
• Views: 1,067
03-26-2014, 09:30 PM
41. ### ANOVA for survey results

I have 5 survey questions where participants gave a response from 1 to 10. Can I use a simple ANOVA test to determine if the mean result of at...

• Replies: 3
• Views: 2,388
03-26-2014, 07:51 PM
42. ### Minimizing impact of age variable

Hi So I'm working with a health outcomes dataset for an entire state. The dataset is also broken up into groups by location within the state. ...

• Replies: 3
• Views: 1,416
03-26-2014, 03:02 PM
43. ### Simple Fishers/Chi Advice Needed!

Hello there, I have a 2x4 table with nominal data (the columns are simply YES/NO, the rows are four categories) Category A: 7, 13 Category B:...

• Replies: 2
• Views: 1,369
03-26-2014, 02:55 PM
44. ### Abnormal Interaction Effect

Hey people, After I have conducted an ordered logistic regression with a DV and two IVs, I get the following result: Two main effects (IV1 on DV,...

• Replies: 0
• Views: 1,041
03-26-2014, 02:13 PM
45. ### determine sample size for data series

Hi, I'm trying to determine if a sample size is large enough for an estimation test. Based on historical numbers from 2002 to 2012 and summarized by...

• Replies: 0
• Views: 1,287
03-26-2014, 09:35 AM
46. ### Fisher's Exact Test

Hello,:wave: I'm currently a doctoral candidate in wildlife ecology. I'm analyzing habitat selection data for bullsnakes collected over three...

• Replies: 8
• Views: 8,608
03-26-2014, 07:32 AM
47. ### Intervention Evaluation and Regression Discontinuity Design

Dear All, I would be very grateful for some guidance, I need to conduct an evaluation of a new intervention programme. I would ideally like...

• Replies: 0
• Views: 1,045
LGF
03-26-2014, 06:23 AM
48. ### Do I need to correct for multiple comparisons in paired t-test ?

This is an EEG experiment, and has three blocks showing different images which are supposed to change the emotional state of the participant....

• Replies: 3
• Views: 2,654
03-26-2014, 05:25 AM
49. ### Problem with variables transformation

Hello, This may be quite a stupid question, but I cannot find a solution anywhere, so maybe you would be able to help. So I have three...

• Replies: 2
• Views: 1,566
03-26-2014, 05:16 AM
50. ### Problems with Moderating effect on 2 IVs

Hello to everyone, I have some problems with my diploma work and I really need your help. I am trying to measure a moderating effect on my...

• Replies: 0
• Views: 1,154
03-26-2014, 03:41 AM
51. ### Factor analysis followed by cluster analysis ( time sensitive)

Hi everyone, I have done a principal component analysis using SPSS and now have 3 components. 2 components have 4 items in the sub scale and 1...

• Replies: 0
• Views: 1,156
03-26-2014, 01:06 AM
52. ### Basic Statistics Question for Gaming Achievements

I was doing a quick project for fun and bragging rights that is related to computer games and achievements. I am provided limited data, and wasn't...

• Replies: 4
• Views: 1,565
03-25-2014, 08:51 PM
53. ### Single Factor ANOVA Guidelines

Hello, I need to understand something regarding ANOVA test. Given the data can they be paired or unpaired or only either of the two? Take this...

• Replies: 3
• Views: 2,381
03-25-2014, 05:39 PM
54. ### Fieller-Hinkley Ratio of Correlated Random Variables: Question On Applying Theory

I am a senior in college writing a thesis analyzing and critiquing government income transfer programs, such as SNAP (food stamps). Here is my...

• Replies: 0
• Views: 997
03-25-2014, 04:35 PM
55. ### homework question

working a problem where a drug store owner suspects 5% still buy film. she wants to discontinue selling film. she keeps track of the number of...

• Replies: 3
• Views: 1,184
03-25-2014, 01:27 PM

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