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An independent-measures research study uses two samples, each with n = 12 participants.  If the data produce a t statistic of t = 2.50, then which of the following is the correct decision for a two-tailed hypothesis test?

What term is used to identify the mean of the distribution of sample means?

If an analysis of variance is used for the following data, what would be the effect of changing the value of M2 to 20?Sample DataM1 = 10    M2 = 15SS1 = 90    SS2 = 70

What is the value of Σ(X – 2) for the following scores?  Scores: 2, 3, 5

If other factors are held constant, how does sample size influence the likelihood of rejecting the null hypothesis and measures of effect size such as r2 and Cohen’s d?

Which combination of factors is most likely to produce a significant value for an independent-measures t statistic?

A student investigated how washing with soap affects bacteria levels on the hands. She tested three different methods—washing with water only, washing with regular soap, and washing with antibacterial soap. She randomly assigned 99 students to one of the 3 treatments. Participants washed their hands with the assigned method and cultures were taken and incubated. Based on the SPSS output below, was there a significant difference among the three hand-washing methods and why?

Which combination of factors is most likely to produce a significant value for an independent-measures t statistic?

A sample has M = 72 and s = 4.  In this sample, what is the X value corresponding to z = –2.00?

One sample has a variance of s2 = 10 and a second sample has a variance of s2 = 6.  If the two samples have the same number of scores, what is the pooled variance for the two samples?