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An Electric Co. Operates a fleet of trucks that provide electrical service to the construction industry. Monthly mean maintenance cost has been $75 per truck. A random sample of 40 trucks provided a sample mean of $82.50 per month, with a sample deviation of $30. Managers want a test to determine whether the mean monthly maintence cost has increased.
A. Using a .05 level of significance, what is the rejection rule for this test?
B. What is your conclusion based on the sample mean of $82.50?
C. What is the p-value associated with the sample result? What is your conclusion based on the p-value?
Hours worked is important predictor of amount of sales.
Complete the ANOVA table. Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
Determine the regression equation. Determine the coefficient of determination. Do you think Mr. Profit should be satisfied with using the size of the offering as the independent variable?
Drawing on one of your interests in the study of criminal justice, develop three hypotheses that can be tested using t-tests. Why do you think it would be interesting or important to test these hypotheses?
A random sample of 500 participants was recruited for the study ? Subjects were allowed to elect to participate in an 3-month exercise program or serve as a control subject (190 chose the program, 310 chose to serve as controls)?
Cheating Gas Pumps When testing gas pumps in Michigan for accuracy, fuel-quality enforcement specialists tested pumps and found that 1299 were not accurate (within 3.3 oz when 5 gal is pumped), and 5686 were accurate.
If the probability of getting caught copying someone else's exam is .1, find the probability of not getting caught in three attempts. Assume independence.
What are the best-case and worst-case outcomes the owner may face on this product if she implements your suggestion?
Determine the likelihood of accepting a lot which is 1% defective?
Those who have quit smoking often return to the habit. The authors of a paper concluded that forbidding smoking in the smoker's residence was a significant predictor of the ability to abstain from smoking.
Test hypothesis that two processes have identical fractions nonconforming. Use a = 0.05. Create 90% confidence interval on difference in fraction nonconforming between two processes.
While it can't be denied that advertising impacts sales, it is also true that advertising is expensive and companies want to advertise in ways that have the greatest benefit for the amount of money spent.
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