View the step-by-step solution to:

# 2) A personnel manager is conducting a study of sales supervisory salaries in this industry. A survey for the salaries of 36 sales supervisors found...

2) A personnel manager is conducting a study of sales supervisory salaries in this industry. A survey for the salaries of 36 sales supervisors found a mean of \$42.91 thousand and a standard deviation of \$19.22 thousand. Determine a 98-percent confidence interval (in thousands of dollars) for the mean of all sales supervisory salaries in this industry. (Round your answer(s) to 3 decimal places.)

98% CI =__________ to_______________

3) Raising in-state and out-of-state tuition is supposed to reduce the number of students in state supported universities. The registrar of a university wants to estimate the proportion, ? , of students who are paying out-of-state tuition on the installment plan (to later be compared with in-state installment plan payers). A random sample of 70 students who live out-of-state is taken and 38 of them pay tuition on the installment plan. Find a 99-percent confidence interval for ? based on these data. (Round your answer(s) to 3 decimal places.)

99% CI = __________ to _____________

4) Population assumption: Normal

n = 16; x = 84; s = 13;

H0: u ??? 84, H1: u > 84; a = 0.01

What test do you use and what is the test statistic? (Round your answer(s) to 3 decimal places.)

t-testz or z-test

Test statistic =___________(3 decimal places)

(1) 98% CI = (35.100 , 50.720)... View the full answer

2) 98% CI = 35.094 to 50.726 3) 99%... View the full answer

### Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

### -

Educational Resources
• ### -

Study Documents

Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

Browse Documents