# Basic Statistics Timed Question 7. Need in 50 Minutes!

Oct 25th, 2015
Anonymous
Category:
Mathematics
Price: \$10 USD

Question description

### Question 7

A health insurer wants to know if having a nurse available to answer simple questions over a telephone hotline could cut costs by eliminating unnecessary doctor visits. Records show the yearly cost of doctor visits has an SD of \$300. They randomly select 225 families, give them access to the hotline, and record the costs of their doctor visits. In this sample, they find the average yearly cost per family to be \$820. Find a 95% confidence interval for the yearly population average cost of doctor visits per family.

Approximately from \$820 to \$860

Approximately from \$800 to \$880

Approximately from \$810 to \$870

Approximately from \$780 to \$860

## Tutor Answer

(Top Tutor) James M847
School: UT Austin
PREMIUM TUTOR

Studypool has helped 1,244,100 students

Review from student
Anonymous
" Thanks, good work "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1822 tutors are online

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors