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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?

For the repeated-measures t statistic, df = ____.

A population of N = 10 scores has a mean of µ = 6.  After one score is removed, the mean is found to be µ = 5.  What is the value of the score that was removed?

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

A researcher conducts an experiment comparing two treatment conditions with 20 scores in each treatment condition. If a matched-subjects design is used, how many subjects are needed for the experiment?

On average, what value is expected for the t statistic when the null hypothesis is true?

Assume that any mean difference is significant. Describe the effects for the table below:   B1 B2 A1 18 22 A2 22 26