If other factors are held constant, which set of sample characteristics is most likely to reject a null hypothesis stating that m = 80?

One sample has n = 10 scores and a variance of s2 = 20, and a second sample has n = 15 scores and a variance of s2 = 30.  What can you conclude about the pooled variance for these two samples?

The results of a two-factor analysis of variance produce df = 2, 36 for the F-ratio for factor A and df = 2, 36 for the F-ratio for factor B.  What are the df values for the AxB interaction?

If given a population mean but not the population’s standard deviation, which test is appropriate?

Kendall got an 80 on her Psychology exam. The mean was 85 and the standard deviation was 2. Tyler got a 75 on his Economics exam. The mean was 80 and the standard deviation was 5. Statistically who did better when the scores are z-scored?

For a population with µ = 40 and s = 8, what is the X value corresponding to z = 1.50?

In an independent-measures ANOVA, dftotal = 9 and dfwithin = 6. What is dfbetween?

On an exam with a mean of 70, you have a score of 65.  Which of the following values for the standard deviation would give you the highest position within the class, or the best score in class relative to other student’s scores?

When comparing three or more groups, why is ANOVA preferred?

A researcher conducts a hypothesis test using a sample of n = 40 from an unknown population  and compares it to a known population mean.  What is the df value for the t statistic?