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A researcher reports an independent-measures t statistic with df = 30.  If the two samples are the same size (n1 = n2), then how many individuals are in each sample?

In a sample of n = 6 scores, the smallest score is X = 3, the largest score is X = 10, and the mean is M = 6.  If the largest score is changed from X = 10 to X = 22, then what is the value of the new mean?

For an independent-measures experiment comparing two treatment conditions with a sample of 10 in each treatment, which of the following identifies the correct df for the F-ratio?

For a repeated-measures study comparing two treatment conditions, a researcher obtains a sample of n = 9 difference scores with a mean of 4 and a variance of 36.  What is the value for the repeated-measures t statistic for these data?

If the mean and variance are computed for each sample in an independent-measures two-factor experiment, then which of the following types of sample data will tend to produce large F-ratios for the two-factor ANOVA?

For an independent-measures experiment comparing two treatment conditions with a sample of 10 in each treatment, which of the following identifies the correct df for the F-ratio?

A sample of n = 20 scores is transformed into z-scores.  What is the mean for the set of 20 z-scores?

An analysis of variances produces dftotal = 29 and dfwithin = 27.  For this analysis, what is dfbetween?

A researcher would like to evaluate the effect of a new reading program for second-grade students. For the past five years, a standardized test given at the end of second grade has produced a mean score of µ = 45. A sample of n = 25 students are placed in the new program and at the end of the school year they obtain a mean test score of M = 51, s = 20. The researcher plans to use these data to test whether the new program has had a significant effect on reading scores. Which of the following hypothesis tests would be appropriate?

An independent-measures research study uses two samples, each with n = 22, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with α = .01, then what are the boundaries for the critical region?