A study was conducted to estimate hospital costs for accident victims

<brclass="apple-interchange-newline">“A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped with a mean of $9004 and a standard deviation of $5629

1. what is the point estimate for the mean hospital cost for victims who wore seat belts.

2. construct and interpret 99percent conf interval estimate for the mean hospital costs for accident victims who wore seatbelts.

<brclass="apple-interchange-newline">3.construct and interpret 92percent conf interval estimate for the mean hospital costs for accident victims who wore seatbelts.

4.which interval is wider and why?