The equation of the linear regression line represents the relationship between the number of years since 2000, x, and the average cost of tuition at a four-year college, y. what does the slope of the line represent? yˆ = 938x + 12,765 for every year since 2000, the cost of tuition increased by $12,765 for every year since 2000, the cost of tuition decreased by $938 for every year since 2000, the cost of tuition increased by $938 the cost of tuition in the year 2000 was $938

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.