One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean of M = 8.  If the two samples are combined, what is the mean for the combined set of scores?

What position in the distribution corresponds to a z-score of z = +2.00?

What is the critical value for a regression analysis with n=45, 1 predictor variable, and an alpha level of 0.01?

For a population with  µ = 80 and ó = 20, the distribution of sample means based on n = 16 will have an expected value of ____ and a standard error of ____.

For a related-samples t-test, the null hypothesis states _____.

For a perfectly symmetrical distribution with a median of 30, what is the value of the mean?

The null hypothesis for a repeated-measures test states:

A researcher selects a sample of n = 17 individuals from a population with a mean of μ = 75 and administers a treatment to the sample. If the research predicts that the treatment will increase scores, then what is the correct statement of the null hypothesis for a directional (one-tailed) test?

The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores.  What is the variance for this population?

For a related-samples t-test, the null hypothesis states _____.