A survey of77commercial airline flights of under 2 hours resulted in a sample average late time for a flight of2.40minutes. The population standard deviation was12minutes. Construct a 95% confidence interval for the average time that a commercial flight of under 2 hours is late. What is the point estimate? What does the interval tell about whether the average flight is late?

Appendix A Statistical Tables

(Round your answers to 2 decimal places, e.g. 25.31.)

enter the lower value of the interval

The point estimate is

enter the point estimate .

The interval is

select an option (conclusive or inconclusive).

Since zero is in the interval, there is a possibility that, on average, the flights are

select an option (not on time or on time).