Describe the error in finding the number of people who live in a circular region with a 7.5-mile diameter and a population density of 1550 people per square mile. Question 2

The formula for the circumference of a circle was used instead of the formula for the area of a circle.

The diameter was substituted into the formula for the area of a circle instead of the radius.

The expression π⋅7.52 should be in the numerator of the fraction, not the denominator.

The expression π⋅7.52 simplifies to 56.25π2, not 56.25π.

Question 3
Correct the error. Round your answer to the nearest whole number.

The number of people who live in the region is about
.

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.