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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: 196,665
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: 66,688
09-30-2005, 09:44 AM

1. two samples from the same population both have M=84 and s^2=20, however one sample has n=10 and the other has n=20 scores. Both samples are used...

• Replies: 2
• Views: 13,582
11-12-2010, 04:06 PM
2. ### Help with SPSS output interpretation: UNIANOVA

Hi everyone, I’m having some troubles with the interpretation of my outputs, I really hope someone can help me out so I can continue interpreting the...

• Replies: 2
• Views: 13,540
09-08-2009, 07:29 AM
3. ### MANOVA and Levene's Test Significant Values

Hi I've conducted a MANOVA with 11 dependent variables. All the other assumptions have been met, except the Levene's test. Levene's test of...

• Replies: 1
• Views: 13,505
03-23-2010, 01:27 AM
4. ### Comparing z-values and t-values

Looking for some feedback as to whether I am on the right track for this problem: Suppose you have selected a random sample of n=7 measurements...

• Replies: 1
• Views: 13,488
11-15-2010, 01:22 PM
5. ### Multiple Choice Question

Hello! Here is the problem: A group of eight people work on the 5th floor of the building.They all decide they want to lose weight by...

• Replies: 4
• Views: 13,446
12-10-2005, 09:25 PM
6. ### interpreting results of 5 point likert scale: statistical significance

Hi, there are many questions on this forum related to likert scale (great forum by the way, I've learnt a lot!), but I could not find the question...

• Replies: 1
• Views: 13,437
01-12-2011, 11:41 AM
7. ### Standard deviation and variance examples needed

I am trying to calculate SS, variance and standard deviation for the following sample of n = 5 scores: 10, 3, 8, 0, 4. Now the sum of squares...

• Replies: 9
• Views: 13,411
02-08-2010, 04:24 PM
8. ### P-Value

What is the relationship between p-valuse and alfa. Are they not almost the same if not completely identical? If p-value is higher than alfa...

• Replies: 4
• Views: 13,368
10-13-2008, 06:15 AM
9. ### sample size calculation based on correlation analysis

For one of my studies, I have a continuous variable ‘x’ for each subject. All the subjects will be given a questionnaire for a symptom assessment and...

• Replies: 9
• Views: 13,344
09-22-2008, 10:37 PM
10. ### Statistics/Probability Question

I'm going over a study guide that I have for a test on Thursday and I'm having issues finding the answer to a "neither" question and I wanted to see...

• Replies: 1
• Views: 13,341
02-14-2009, 11:42 PM
11. ### reading MAT files in R

I am new to R so please excuse me if my question sounds naive. I downloaded the package R.matlab as I want to use the function readMAT (is there...

• Replies: 1
• Views: 13,304
05-23-2011, 09:30 PM
12. ### How can I do a contrast in a repeated measures ANOVA using SPSS?

I am trying to do a repeated measures (with three conditions), and I'm trying to compare the first condition to the last two. So in essence I really...

• Replies: 2
• Views: 13,300
11-10-2009, 01:58 PM
13. ### Repeated Measures ANOVA - adding a covariate and interpreting the ouput in SPSS

Hi there, I have recently conducted an experiment and have began analysing the data. I am investigating the effect equipment size has on...

• Replies: 2
• Views: 13,297
06-23-2012, 09:06 PM
14. ### Eigenvalues

Hi Would you mind explaining the concept of the eiganvalue to me? Thank you Diane

• Replies: 1
• Views: 13,281
03-04-2006, 10:43 PM
15. ### Find the marginal distribution?

deleted...

• Replies: 2
• Views: 13,268
03-27-2009, 05:49 PM
16. ### Finding z score of skewness and Kurtosis

Dear all, I'm studying stat from Andy Field's "DISCOVERING STATISTICS USING SPSS" 3rd ed. In chapter 5 (Exploring assumptions) page 138 the...

• Replies: 1
• Views: 13,267
BGM
01-05-2012, 10:11 AM
17. ### does anybody know how to learning statistics online free?

hi everybody, i was wondering if anybody here might know a good site to learn statistics online without paying. if anyone does know a good site a...

• Replies: 4
• Views: 13,252
04-24-2013, 08:00 PM
18. ### z and t tests

I've found myself struggling in Statistics since I just can't seem to grasp the explanations through symbols and equations, and am having...

• Replies: 0
• Views: 13,239
11-30-2009, 01:09 PM
19. ### Duncan's MRT test in SPSS

Hi guys, Though a researcher, I must admit that I’m having real troubles with statistics. I have to make Duncan’s new multiple range test, and after...

• Replies: 4
• Views: 13,202
09-21-2010, 06:45 PM
20. ### ACF and PACF in excel

Hi, I'm looking for some help regarding calculating the PACF of a time series in excel (I already have a working formula for the ACF) Any...

• Replies: 2
• Views: 13,193
11-02-2008, 04:25 AM
21. ### Equal sample sizes for Kruskal-Wallis required?

Hi there I have a dataset where I'm applying Kruskal-Wallis test because it's not normal distributed and I have one ordinal dependant variable and...

• Replies: 2
• Views: 13,169
12-28-2010, 02:46 AM
22. ### Transform data or non-parametric test of association?

Hello :wave: This is my first post so hope it's in the right place. I am totally stuck, and am adding stats to the list of the things I can't...

• Replies: 4
• Views: 13,148
05-12-2009, 04:45 AM
23. ### MLE for X ~ Exp(λ)

Let (X1, ... Xn) be a random sample from a random variable. Find the maximum likelihood estimator for λ. I know the answer to this but do you...

• Replies: 14
• Views: 13,134
07-22-2014, 07:13 AM
24. ### simple linear regression question

just had a question last week on a test that asked to switch the dependent and explanatory variables (x and y) and determine the effect on the slope....

• Replies: 1
• Views: 13,124
03-11-2008, 03:36 PM
25. ### Outliers in SPSS

I`m doing multiple regression here. I use Casewise Diagnostics during regression analysis to check for outliers....where "case number xx" with...

• Replies: 0
• Views: 13,123
06-04-2010, 07:44 AM
26. ### Power and sample size for a paired t test

Hi, I am trying to find out the way to calculate the power and number of samples required for a paired t test. And also to reverse engineer to work...

• Replies: 1
• Views: 13,099
10-17-2009, 04:02 PM
27. ### 2 way anova vs.2 factor anova vs. block anova

My head is swimming with terms. We learned a one way anova and then a block anova. The example was rows of different sporting good items and columns...

• Replies: 3
• Views: 13,092
11-19-2010, 10:48 AM
28. ### Type II error calculation

My question: It is desired to test H0: μ = 55 against H1: μ < 55 using α = 0.10. The population in question is uniformly distributed with a standard...

• Replies: 7
• Views: 13,091
08-14-2011, 12:42 PM
29. ### Acceptable significance level for Chi-Square statistic

Hi All, I need to know if the significance level calculated for a particular Chi-square statistic is less than or equal to 0.05, can we reject the...

• Replies: 4
• Views: 13,083
06-17-2010, 08:20 AM
30. ### Critical t value with .04 significance level

The problem I am working on tests a claim with a significance level of .04 and it's a left-tailed test with degrees of freedom at 84. In my...

• Replies: 4
• Views: 13,064
08-13-2006, 11:48 PM
31. ### Decision table for statistical tests

Hi there, does anybody know a good decision table for statistical test. The only one I have found and of which I think is ok to use is this one...

• Replies: 2
• Views: 13,032
12-02-2009, 09:11 AM
32. ### Need help finding standardized test statistics!!!! PLEASE!!

I have two homework problems that I can't seem to find the formulas on how to do this anywhere! Can anyone help me? I've tried to follow what I...

• Replies: 1
• Views: 12,964
06-30-2008, 09:11 PM
33. ### Hypothesis testing with multinomial distributions

If you throw a die and record the outcomes, you can test if the die is 'fair' with a chi-test. But how can you use the same data to determine with a...

• Replies: 12
• Views: 12,884
01-07-2010, 04:48 PM
34. ### Correlation - change over time

Hiya, Apologies if this is a really basic question or if I'm just over-complicating things...I have a question related to correlations. I have 2...

• Replies: 1
• Views: 12,874
02-15-2010, 12:36 PM
35. ### Question on decision rule

I'm a little confused on how to make a decision rule given an alpha value. For example if the problem was a two ailed z test with a alpha of .03,...

• Replies: 3
• Views: 12,828
03-03-2006, 02:17 PM
36. ### cohen's d

If the sample size were n= 36, what value would be obtained for Cohn’s d ? How does sample size influence the measure of effect size? Cohn`s d =...

• Replies: 1
• Views: 12,817
10-16-2010, 09:17 AM
37. ### Lack of fit meaning

Hello! I am a researcher fellow in the chemical engineering area and recently applied experimental design to my experiments. However I am having...

• Replies: 8
• Views: 12,798
11-23-2011, 04:47 AM
38. ### sample proportion

if a random sample size of 100 is selected from population p=.40, what is the value of p bar, or the sample proportion?

• Replies: 1
• Views: 12,788
09-09-2007, 02:30 AM
39. ### How to 'reflect' negatively skewed data?

Hello all, I have some not-normally distributed data so I want to log-transform it for my analysis. My data is negatively skewed and if I...

• Replies: 6
• Views: 12,769
10-05-2011, 08:10 AM
40. ### Likert Scale (1-5) statistical analysis

Hi, I have done my search on this website and google and have found my statistical test to be either t-test or chi-square so I'd like you guys to...

• Replies: 47
• Views: 12,723
07-23-2012, 07:29 PM
41. ### Filling in ANOVA table

Below is a past exam question... Don't worry about i or ii because I can do them. r = 0.8 and 95% CI for rho is (0.71, 0.87), which is...

• Replies: 2
• Views: 12,721
11-22-2005, 11:17 PM
42. ### Minimum n for Chi square Test?

Hey folks, I'm currently evaluating the data of a study we performed. Just got a very simple question: Is the a minimum number of subject...

• Replies: 2
• Views: 12,672
06-03-2008, 09:12 AM
43. ### Logistic regression models with insignificant independent variables: valid?

I'm using logistic regression to try to make predictions about the dependent variable. My model contains three independent variables (x, y,...

• Replies: 3
• Views: 12,660
12-15-2008, 11:30 PM
44. ### Non-parametric correlation help!

I need to look for a correlation between a continuous variable (volume) and a dichotomous variable (metastasis). Can anybody suggest the correct test?

• Replies: 6
• Views: 12,654
mcw
07-07-2008, 07:35 AM
45. ### Beta distribution

Hi, Could you please advise how to estimate the 95% confidence interval for the mean if the data which follows a beta distribution? Thank you...

• Replies: 7
• Views: 12,626
01-26-2009, 03:32 PM
46. ### Tukey's post-hoc for 2-way ANOVA?

I ran a 2-way ANOVA, which showed an interaction effect. Let's say the independents are Color and Shape. And the dependent is Weight. Then I...

• Replies: 2
• Views: 12,623
10-06-2008, 01:07 PM
47. ### Chi-squared test for multiple samples?

I have a problem that I can't seem to find an answer to in my statistics books or via Google, so I thought you guys might be able to help. I have...

• Replies: 6
• Views: 12,622
04-08-2013, 01:50 PM

Dealing with nominal-qualitative, ordinal-qualitative, and quantitative data: 1) License plates - nominal qual. 2) Names of the top 10 NFL players...

• Replies: 1
• Views: 12,599
11-10-2009, 12:16 AM
49. ### First and second order model analysis

Hello everybody, this is my first post so if I am doing something wrong please let me know! You see the model has 3 independent variables that...

• Replies: 1
• Views: 12,592
10-05-2009, 01:37 PM
50. ### Are there variations of the exponential distribution formula

I have been trying to solve the question below for over an hour. I even found the answer to a similar problem on a Web site, but I can't understand...

• Replies: 6
• Views: 12,576
04-17-2010, 02:11 PM
51. ### ROC significance

Hi all! I'm using ROC analysis and would need to calculate whether a certain area under the ROC curve differs from 0.50 significantly. Here is...

• Replies: 2
• Views: 12,556
11-05-2010, 03:56 AM
52. ### Pearson's or Spearman's?

I've plotted a scatterplot of rock pool length against limpet frequency, and I have to look for a correlation. The data is fairly widely scattered,...

• Replies: 12
• Views: 12,536
02-01-2013, 02:23 PM
53. ### Extended Fisher's Exact Test

Hi all, Over the last couple of months I have been on a very steep learning curve with statistics, having looked into Chi squared, log-linear...

• Replies: 3
• Views: 12,532
02-17-2009, 03:31 PM

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