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An owner of a retail outlet sold and provided service for copying machines. One type of machine, the DW 140 model, needed service often. The owner was interested in the mean time required to service this model, and decided not to carry the model if the mean repair time appeared to be more than 40 minutes. The repairman provided the following 39 times (in minutes):
23
27
28
33
35
37
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
56
57
61
62
Solve the equations using linear algebra
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Evaluate the multiple regression model between quantity sold (Y) and following explanatory variables: average price of deep-dish pizzas, monthly advertising expenditures, and disposable income per household in areas surrounding outlets.
Find out the sample size raised by mean also standard deviation, a sampling distribution may approach among which of the following values.
A. Determine the regression equation. B. Determine the estimated sales if 40 contacts are made.
The management of a regional bus line thought its cost of gas might be correlated with its passenger/mile ratio. Comment on the data and correlation matrix below.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Is it reasonable to compute that the mean of the population is actually $15,000.
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Use the normal approximation to find the probability that x = 2.
When the p-value is used for hypothesis testing, the null hypothesis is rejected if
Suppose these data represent whole population. Determine the population mean and population standard deviation.
The probabilities of low, medium and high compliance are 0.3, 0.4, and 0.3, respectively
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