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Ryan, Engineer

Category: Math Homework

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Experience: B.S. in Civil Engineering

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QUESTION 26 Independent random samples were taken from

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QUESTION 26 Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building Company under (a) a fixed-position layout (n = 7) and (b) a project layout (n = 8). The company wants to know if the variances in the yearly production of ships for the 2 layouts are equal. The sample variances (s2) are: fixed-position layout = 9, project layout = 4. Use .10 for the level of significance. QUESTION 27 An advertising firm is trying to determine the demographics for a new product. They have randomly selected 75 people in each of 5 different age groups and introduced the product to them. The results of the survey are given below. At a = 0.01, test whether there is any difference in projected buying patterns among the different age groups. FUTURE ACTIVITY AGE GROUP 18-29 30-39 40-49 50-59 60+ Buy frequently 12 18 17 22 32 Seldom buy 18 25 29 24 30 Never buy 45 32 29 29 13 The manager of the Neuse River Bridge is concerned about the number of cars “running” the toll gates and is considering altering the toll-collection procedure if such alteration would be cost-effective. She randomly sampled 16 hours to determine the rate of violation. The resulting numbers of violations per hour were: 7, 6, 5, 8, 9, 7, 10, 4, 5, 7, 6, 8, 6, 9, 8, 7. Determine the 95% confidence interval for the population mean (µ).