A director knew that executives in general have an average score of 120 with a standard deviation of 25 on stress and that the scores are normally distributed. In order to learn whether executives who exercise regularly have lower stress scores, the program director measured the stress of one exercising executive and found her to have a score of 66. Using significance level of 1%, what can the program director conclude?

A doctor believed that patients had varied preferences in type of treatment for social anxiety disorder. He recruited 20 individuals and asked their preferences. He reported the following: 5 preferred exposure therapy, 10 preferred group therapy, and 5 preferred one-on-one counseling.

What is the probability that you randomly select a patient who preferred exposure therapy?

What is the probability that you randomly select a patient who does not prefer one-on-one counseling?

What visual representation would be appropriate for the above data and why?