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Which is the strongest correlation?

Using letter grades (A, B, C, D, and F) to classify student performance on an exam is an example of measurement on a(n) ____ scale of measurement.

A population of scores has µ = 80.  In this population, a score of X = 86 corresponds to z = +2.00.  What is the population standard deviation?

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.  If the researcher uses a one-tailed test with alpha = .01, then which of the following correctly identifies the critical region?

What is the critical value for a correlation with n=25, two-tailed, and an alpha level of 0.05?

A set of N = 10 scores has a mean of µ = 50.  If 20 points are added to one of the scores, what is the new value for the population mean?

A researcher studies the number of dogs in an average household in Wisconsin. The number of dogs is an example of a(n) _________ variable.

For an independent-measures t statistic, what is the effect of increasing the number of scores in the samples?

Two samples, each with n = 8, produce an independent-measures t statistic of t = –2.15.  Which of the following decisions is justified?

A population of scores has µ = 80.  In this population, a score of X = 86 corresponds to z = +2.00.  What is the population standard deviation?