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

Oct 25th, 2015
FratBro23
Category:
Statistics
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

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