1.City Trucking, Inc., claims consistent delivery times for its routine customer deliveries. Asample of 22 truck deliveries shows a sample variance of 1.5. Test to determine whetherH0: s2  1 can be...

1.City Trucking, Inc., claims consistent delivery times for its routine customer deliveries. Asample of 22 truck deliveries shows a sample variance of 1.5. Test to determine whetherH0: s2  1 can be rejected. Use a  .10.2. A sample of 9 days over the past six months showed that a dentist treated the followingnumbers of patients: 22, 25, 20, 18, 15, 22, 24, 19, and 26. If the number of patientsseen per day is normally distributed, would an analysis of these sample data reject thehypothesis that the variance in the number of patients seen per day is equal to 10? Use a.10 level of significance. What is your conclusion?3. Asample standard deviation for the number of passengers taking a particular airline flightis 8. A 95% confidence interval estimate of the population standard deviation is 5.86 passengersto 12.62 passengers.a. Was a sample size of 10 or 15 used in the statistical analysis?b. Suppose the sample standard deviation of s  8 was based on a sample of 25 flights.What change would you expect in the confidence interval for the population standarddeviation? Compute a 95% confidence interval estimate of s with a sample sizeof 25