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A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 63 months and a standard deviation of 9 months. Using the 68-95-99.7 rule, what is the approximate percentage of cars that remain in service between 81 and 90 months?
Do not enter the percent symbol.
ans = %
Applying the MSE measure of forecast accuracy, would you prefer a smoothing constant of x = 0.1 or x = 0.2 for the gasoline sale time series. Are the results the same if you apply MAE as the measure of accuracy?
Ten different people's income tax returns are done by each of the three software packages and the time is recorded for each. Which of the following is true?
Rental car gasoline prices per gallon were sampled at eight major airports. Date for Hertz and National car rental companies follow (USA today April 4, 2000)
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
to compare two kinds of front-end design six of each kind were installed on a certain make of compact car. then each
If a subscriber spent less than $500 for personal or vacation travel during the past 12 months, the circulation department will no longer hand-deliver each issue. What is the probability that a randomly selected subscriber will no longer receive h..
If a random sample of 250 divorcing couples reveals that 53 of them have great difficulties in splitting their family assets, construct a 90% confidence interval for the proportion of all couples getting divorced who encounter such problems.
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
What is the first thing that the team from the advertising production department should do to reduce the number of errors? Explain
One problem with owning fishing boats is that barnacles, a type of sea creature, attach themselves to the bottom of boats.
What is the probability that the shipment will be rejected? If the retailer inspects 6 of the CD shipment what is the probability that the shipment will be accepted?
In one test, a group of 128 teenagers were shown commercials featuring rock music, and their purchasing frequency of the advertised products over the following.
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