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23. A snack food manufacturer selected a sample of...

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23. A snack food manufacturer selected a sample of 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence interval estimate for the true mean weight of bags of this type of pretzel. A. (9.92, 12.34) B. (8.54, 11.46) C. (10.42, 10.58) D. (9.92, 10.08) 24. The city of Oakdale wishes to see if there is a linear relationship between the temperature and the amount of electricity used (in kilowatts). Based on the data in the table below, is there a significant linear relationship between temperature and the amount of electricity used? These data are also available in the worksheet temperature in the Excel workbook MATH302_Final.xls. Temperature (x) 73 78 85 98 93 81 76 105 Kilowatts (y) 680 760 910 1510 1170 837 600 1800 A. Yes, the sample correlation coefficient is equal to 0.981, which provides evidence of a significant linear relationship. B. Yes, the sample correlation coefficient is equal to 0.878, which provides evidence of a significant linear relationship. C. No, the sample correlation coefficient is equal to 0.098, which does not provide evidence of a significant linear relationship. D. No, the sample correlation coefficient is equal to 0.981, which does not provide evidence of a significant linear relationship 7. An agent for a residential real estate company in a large city would like to be able to predict the monthly rental cost of apartments based on the size of the apartment. Data for a sample of 25 apartments in a particular neighborhood are provided in the worksheet Apartments in the Excel workbook MATH302_Final.xls. At the .05 level of significance determine if the correlation between rental cost and apartment size is significant. A. No, there is not a statistically significant linear relationship between monthly rental cost and apartment size, because the sample correlation coefficient is less than .95. B. Yes, there is a statistically significant linear relationship between monthly rental cost and apartment size, because the p-value for this test is less than .0001. C. Yes, there is a statistically significant linear relationship between monthly rental cost and apartment size, because the t-test value, 7.74, is greater than the critical value 1.96. D. Yes, there is a statistically significant linear relationship between monthly rental cost and apartment size, because the sample correlation coefficient 0.85 exceeds 0.50. 8. Given the same data referenced in problem 7 above, find the estimated regression equation which can be used to estimate the monthly rent for apartments in this neighborhood using size as the predictor variable. A. B. C. D. 9. Given the same data referenced in problem 7 above, find a point estimate for the average monthly rent for apartments having 1,000 square feet of space. Place your answer, rounded to the nearest whole dollar, in the blank. When entering your answer into the Final Exam Shell do not use any labels or symbols. Simply provide the numerical value. For example, 123 would be a legitimate entry. ________________

 

Paper#9868 | Written in 18-Jul-2015

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