Many Walmart stores have automotive departments where customers can buy tires, have their vehicles ...

Many Walmart stores have automotive departments where customers can buy tires, have their vehicles serviced, and obtain other automotive services.
 
  Recently, the manager at an Ohio Walmart collected data on the time customers had to wait to get the desired automotive service. Of the 500 cars in the sample, the shortest time any customer spent waiting was 3 minutes and the longest time was 183 minutes. Assuming that the manager wishes to develop a frequency distribution with 9 classes, which of the following would be an appropriate class width for each class?A) 10.50
  B) 19.99
  C) 20.00
  D) 3 to 23

Q. 2

Which distribution is used in testing the hypotheses about the equality of two population variances?
 
  A) z-distribution
  B) F-distribution
  C) x2 distribution
  D) t-distribution

Q. 3

A local FedEx/Kinkos has three black-and-white copy machines and two color copiers. Based on historical data, the chances that each black-and-white copier will be down for repairs is 0.10.
 
  The color copiers are more of a problem and are down 20 of the time each.Based on this information, what is the probability that if a customer needs a color copy, both color machines will be down for repairs?A) 0.04
  B) 0.96
  C) 0.47
  D) 0.42

Q. 4

In analyzing the sampling distribution of a proportion, doubling the sample size will cut the standard deviation of the sampling distribution in half.
 
  Indicate whether the statement is true or false

Q. 5

Men have a reputation for not wanting to ask for directions. A Harris study conducted for Lincoln Mercury indicated that 42 of men and 61 of women would stop and ask for directions. The U.S.
 
  Census Bureau's 2012 population estimate was that for individuals 18 or over, 48.2 were men and 51.8 were women. This exercise addresses this age group.Given that a driver stops to ask for directions, determine the probability that the driver was a man.A) 0.518
  B) 0.420
  C) 0.316
  D) 0.390

Q. 6

Suppose an airline decides to conduct a survey of its customers to determine their opinion of a proposed one-bag limit.
 
  The plan calls for a random sample of customers on different flights to be given a short written survey to complete during the flight. One key question on the survey will be: Do you approve of limiting the number of carry-on bags to a maximum of one bag? Airline managers expect that only about 15 will say yes. Based on this assumption, what size sample should the airline take if it wants to develop a 95 confidence interval estimate for the population proportion who will say yes with a margin of error of 0.02?A) 1151
  B) 1341
  C) 1512
  D) 1225