A sample of n = 25 scores produces a t statistic of t = 2.062.  If the researcher is using a two-tailed test, then which of the following is the correct statistical decision?

A researcher conducts an experiment to determine whether moderate doses of St. Johns wort have any effect on memory for college students.  For this study, what is the independent variable?

A researcher obtains an F-ratio with df = 3, 12 from an ANOVA for a repeated-measures research study.   How many subjects participated in the research study?

In a two-factor ANOVA, which of the following is not computed directly but rather is found by subtraction?

A researcher is interested in attitudes toward same-sex couples after hearing a persuasive talk about equal rights. Data was collected from 60 participants. Each person completed a survey that measured attitudes toward same-sex couples on a scale of -7 (very negative) to +7 (very positive) before and after the persuasive speech. What test is most appropriate to use to analyze this data?

A sample of n = 4 scores is selected from a population with an unknown mean.  The sample has a mean of M = 40 and a variance of s2 = 16.  Which of the following is the correct 90% confidence interval for µ?

An independent-measures research study uses two samples, each with n = 12, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with α = .05, then what are the boundaries for the critical region?

An analysis of variance produces SStotal = 80 and SSwithin = 30.  For this analysis, what is SSbetween?

A population has µ = 50 and s = 5.  If 10 points are added to every score in the population, then what are the new values for the mean and standard deviation?

If a repeated-measures study shows a significant difference between two treatments with alpha = .01, then you can be sure that ____.