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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