If all scores in a distribution are negative values, then the standard deviation will also be a negative value.

If the coefficient of determination is .09 and the sum of squares regression is 88, then the total variation in Y must be SSY = 108.

A researcher decides to split scores on an exam into quartiles. She determines that a score of 64 is at the 25th percentile, a score of 74 is at the 50th percentile, and a score of 80 is at the 75th percentile. What is the interquartile range (IQR) for these data?

A researcher computes an analysis of regression with 1 and 18 degrees of freedom. If F = 3.05, then the decision will be that X is a significant predictor of variation in Y.

One step to hypothesis testing is to set the criteria for a decision.

Researchers generally aim to maximize the power of a decision.

A researcher wants to know the probability of selecting a student athlete from a school population where 5% of students are athletes. If the researcher selects a sample of 120 students, is it appropriate to use the normal approximation of the binomial distribution to estimate this probability?

It is appropriate to use the normal approximation of the binomial distribution with a sample of 100 participants, where p = .07 and q = .93.

In a hypothetical job field, 10% of workers are promoted within their first year of employment. For this hypothetical job field, what is the probability that exactly 25 workers were promoted in their first year in a random sample of 200 workers? Hint: This is a binomial distribution, where p = .10 and q = .90.

The value for power can range between −1.0 and +1.0.