Author Question: A consumer group plans to test whether a new passenger car that is advertised to have a mean highway ... (Read 129 times)

jayhills49 · **on:** Jun 24, 2018

A consumer group plans to test whether a new passenger car that is advertised to have a mean highway miles per gallon of at least 33 actually meets this level.

They plan to test the hypothesis using a significance level of 0.05 and a sample size of n = 100 cars. It is believed that the population standard deviation is 3 mpg. Based upon this information, if the true population mean is 32.0 mpg, what is the probability that the test will lead the consumer group to accept the claimed mileage for this car?
A) About 0.45
B) Approximately 0.0455
C) About 0.9545
D) None of the above

Question 2

The number of customers who enter a bank is thought to be Poisson distributed with a mean equal to 10 per hour. What are the chances that no customers will arrive in a 15-minute period?

A) Approximately zero
B) 0.0067
C) 0.0821
D) 0.0250