An owner of a miniature golf course wants to know how many strokes it takes to get the ball in the last hole. The owner randomly selects 40 golfers and asks them how many strokes it took them. The owner then constructs a
90% confidence interval for the true mean number of strokes to get the ball in the hole. Which of the following
would decrease the margin of error?
using a sample of size 30
using a sample of size 75
constructing a 95%confidence interval
constructing a 99%confidence interval

The survey of study habits and attitudes (ssha) is a psychological test that measures the motivation, attitude toward school, and study habits of students, scores range from 0 to 200. the mean score for u.s. college students is about 115, and the standard deviation is about 30. a teacher who suspects that older students have better attitudes toward school gives the ssha to 55 students who are at least 30 years of age. the mean score is 113.2. assume the population standard deviation is 30 for older students what is the margin of error for a 95% confidence interval for the population mean score for a. older students? b. compute the 95% confidence interval for the population mean score for older students. c. compute the 99% confidence interval for the population mean score for older students. d. compute the 88% confidence interval for the population mean score for older students.