In 2020, 16.9% flights arriving to LAX were 15 minutes or more late. Theaverage “arriving late” time was 11.93 minutes per flight. Investigators want tosee whether the delay times have changed since 2020.The available data set from 2021 shows 10 randomly selected airlines and theirarrival information for each month.SHOW YOUR WORK FOR EACH QUESTION!1. First you need to investigate whether the proportion of late flights has changed from 16.9%.a. Write the null and alternative hypotheses.

At Denver International Airport, 82% of recent flights have arrived on time. A sample of 14 flights is studied. Round the probabilities to four decimal places.Part 1 of 4(a) Find the probability that all 14 of the flights were on time.The probability that all 14 of the flights were on time is .Part 2 of 4(b) Find the probability that exactly 12 of the flights were on time.The probability that exactly 12 of the flights were on time is .Part 3 of 4(c) Find the probability that 12 or more of the flights were on time.The probability that 12 or more of the flights were on time is .Part 4 of 4(d) Would it be unusual for 13 or more of the flights to be on time?It ▼(Choose one) be unusual for 13 or more of the flights to be on time since the probability is

Accordingto statistics released by the Department of Civil Aviation, the average delayof flights is equal to 16.8 minutes, flight delays are assumed to follow anormal distribution.  However, from asample of 50 flights, the average delay was estimated to be 19.5 minutes andthe sample standard deviation was 6.6 minutes.Conducta hypothesis test to disprove the claim that the average delay is equal to 16.8minutes at a= 0.01.

The last 1500 Air America flights 315 have been delayed. What is the probability that a flight with this airline will not be delayed?

Adam also believes that airlines systematically increase the price of a roundtrip fare from Sydney to Paris on Thursdays. He collects a sample of data by checking the websites of airlines for flights that depart on a Tuesday (Pop. 1) and on a Thursday (Pop. 2). Test his claim at the 5% level of significance. Use worksheet C of the Excel Exam data file to answer this question.

Suppose the wait to pass through immigration at JFK Airport in New York is thought to be bell-shaped and symmetrical with a mean of 19 minutes. It is known that 68% of travelers will spend between 5 and 33 minutes waiting to pass through immigration. The standard deviation for the wait time through immigration is _________.Multiple Choice18 minutes17 minutes14 minutes16 minutes