The police reported that the average driver exceeds the 50 miles per hour speed limit by more than 9 miles per hour on the busiest street in a small town. A sample of 63 randomly selected cars were...

The police reported that the average driver exceeds the 50 miles per hour speed limit by more than 9 miles per hour on the busiest street in a small town. A sample of 63 randomly selected cars were clocked by airplane radar. The average speed was 57.5 miles per hour, and the standard deviation of the speeds was 4.17 miles per hour. Determine if the average speed is greater than what the police department reported.

1. Which parameter(s) are you given? Mark all that apply.
   
   
   

   
   
   • p
   
   
   • μ
   
   
   • σ
   
   
   • none
   
   

   
   
   
   


2. Which statistic(s) are you given? Mark all that apply.
   
   
   

   
   
   • ¯x
   
   
   • ˆp
   
   
   • ˆq
   
   
   • s
   
   
   • x
   
   
   • none
   
   

   
   
   
   


3. What is the problem asking you to do?
   
   
   

   
   
   • Estimate a parameter
   
   
   • Test a given parameter