A repeated-measures study comparing two treatments with a sa…

A repeated-measures study comparing two treatments with a sample of n = 4 participants produces a mean of M = 18 with SS = 24 for the scores in the first treatment, a mean of M = 14 with SS = 18 for the scores in the second treatment, and a mean of M = 4 with SS = 12 for the difference scores.  What is the estimated standard error for the sample mean difference?

A researcher selects a sample of 100 people to investigate t…

A researcher selects a sample of 100 people to investigate the relationship between gender (male/female) and registering to vote.  The sample consists of 40 females, of whom 30 are registered voters, and 60 males, of whom 40 are registered voters.  If these data were used for a chi-square test for independence, what is the expected frequency for registered females?

An analysis of variance is used to evaluate the mean differe…

An analysis of variance is used to evaluate the mean differences for a research study comparing four treatments with a separate sample of n = 8 in each treatment.  If the data produce an F-ratio of F = 5.50, then which of the following is the correct statistical decision?