The Wechsler Adult Intelligence Scale (WAIS) is the most common IQ test. The distribution of scores for adults taking the WAIS is approximately Normal with a mean of 100 and a standard deviation of 15 . Use the 68 – 95 – 99.7 rule to answer the questions about WAIS scores.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length