Explain why the assumption of equal variance is irrelevant for the paired-samples t-test.
Explain why the assumption of equal variance is irrelevant for the paired-samples t-test.
when variances between two samples are not equal in a paired sample t test, the pooled variance must be computed and used 8n place of the estimated standard error. t or f
In a paired samples t test, explain the logic of difference scores (why do you need to find them to make conclusions about your research) and why do you compare it to a population mean often designated as zero (µ = 0)?
Create two different data sets such that a T test under the assumption of equal variances will reject the null hypothesis, but the T test under the assumption of unequal variances (Hint: Welch's T statistic) will fail to reject the null hypothesis. Explain why the two data sets fail to reject under unequal variance assumption and why it rejects until equal variance assumption. Thanks
1. What does the paired-samples t-test test for? 2. The paired-samples t-test utilizes a within-subjects design. What is the main difference between a within-subjects design and a between subjects design? 3. What is the difference between a repeated measures and a matched design?
The equation for the paired-samples t test is the same as that for the single-samples t test except that the data are now difference scores. True False
Paired-samples t test and graduate admissions: Is it harder to get into graduate programs in psychology or in history? We randomly selected five institutions from among all U.S. institutions with graduate programs. The first number for each is the minimum grade point average (GPA) for applicants to the psychology doctoral program, and the second is for applicants to the history doctoral program. These GPAs were posted on the Web site of the well-known college guide company Peterson’s. Wayne State University:...
Look at the table for the Paired samples test to find your t calculated, df, and significance. Remember that significance level will appear in the Sig (2-tailed) column. Any value that is smaller than .05 will be significant at the .05 level or higher. In a sentence describe the results and report them in APA style, including r2 and evaluation (you will need to calculate r2 by hand). 3. What type of error in hypothesis testing is possible given the...
only need 2-sample t-test for equal variance filled out 1. Create a table using the provided headings for the following tests. The comparison is what is being statistical tested. The other assumptions column should be any additional information needed to distinguish when that test is used as compared to the other tests in the table. (5 pts) Tests to include: 2-sample t-test for equal variance, 2-sample t-test for unequal variance, Mann-Whitney U-test, Z-test, Paired t-test, Wilcoxon Signed Rank Test, 1-Sample...
Levene's test for homogeneity of variance meets the assumption of equal variances in ANOVA when the test is statistically non-significant, that is when sig. value in SPSS output is more than 0.05 Question 18 options: True False
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean difference is 5, the standard deviation of the difference scores is 15, and the sample size is 85. The researcher is also using a typical null hypothesis that proposes no differences between the relevant population means. Under these circumstances, what is the value of the paired-samples t statistic? Please retain a minimum of three decimal places for all steps (if relevant) and provide a...