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Q1) Accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes 2 construction workers a mean of 32 hours and standard deviation of 2 hours to erect Red Barn model. Suppose the assembly times follow normal distribution.
a) Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
b) Determine percent of garages take between 29 hours and 34 hours to erect?
c)What percent of garages take 28.7 hours or less to erect?
d) Of the garages, 5 percent take how many hours or more to erect?
Determine the estimated population mean?
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The Central Limit Theorem states that the sampling distribution of means is:
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
At 0.05 level of significance, is there evidence of noteworthy difference in variation in sales among different aisle locations?
A certain airplane has 2 independent alternators to provide electrical power. The probability that a given alternator will fail on a 1 hour flight is 0.02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the othe..
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A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
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The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
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