A bank’s loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of...

A bank’s loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 170 and 220.

Suppose for 40 observations the variance is 50. If all the observations are increased by 20, the variance of these increased observations will be?

These descriptive measures are from a sample of time measurements: x̅= 21.3 seconds; s = 1.7 seconds; and n = 400. At least what proportion of the data lies within 2 and 3/4 standard deviations from the arithmetic mean?

In a study, subjects are randomly assigned to each of three groups: control, treatment A, and treatment B. After the experimental treatments were administered, the data on the three groups are compared. The appropriate statistical test to compare the means of the three groups would be the?

The strength or degree of relationship between an independent variable X and a dependent variable Y, both measured in at least an interval level, is measured by the?