A city planner working on bikeways designs a questionnaire to obtain information about local bicycle commuters. One of the questions asks how long it takes the rider to pedal from home to his or her...

A city planner working on bikeways designs a questionnaire to obtain information about local bicycle commuters. One of the questions asks how long it takes the rider to pedal from home to his or her destination. A sample of 22 bicycle commuters have a mean of 25.82 minutes and a standard deviation of 7.71 minutes. Find a 90% confidence interval for the mean commuting time for all local bicycle commuters in the city.