Which of the following sets of sample data would produce the smallest value for an independent-measures t statistic?

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?

For the population of scores shown in the frequency distribution table, the mean is ____.X    f5    24    13    32    21    2

What term is used to describe the shape of a distribution in which the scores pile up on the left-hand side of the graph and taper off to the right?

For a normal population with µ = 40 and σ = 10 which of the following samples is least likely to be obtained?

Which of the following sets of sample data would produce the smallest value for an independent-measures t statistic?

Under what circumstances is a score that is 5 points above the mean considered a central value–meaning it is relatively close to the mean?

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

A population of scores has µ = 44.  In this population, a score of X = 40 corresponds to z = –0.50.  What is the population standard deviation?

What is the critical value for a correlation with n=20, one-tailed, and an alpha level of 0.05?