Statistics > STUDY GUIDE > MATH 221 Week 7: Quiz: Statistics for Decision-Making With Answers. (All)

MATH 221 Week 7: Quiz: Statistics for Decision-Making With Answers.

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From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is 45.8 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? (5.71, 5.89) (5.74, 5.90) 10/20/2018 Week 7: Quiz: Statistics for Decision-Making - 10586 https://devryu.instructure.com/courses/31509/quizzes/96254?module_item_id=3912124 2/19 (5.72, 5.88) Correct! (5.73, 5.87) Ques 2 / 2 pts tion 2 If a confidence interval is given from 8.50 to 10.25 and the mean is known to be 9.375, what is the maximum error? 0.438 8.500 1.750 0.875 Correct! Ques 0 / 2 pts tion 3 (CO6) If the standard deviation of a sample decreases without other changes, what is most likely to happen to the confidence interval? widens cannot determine You Answered does not change narrows Correct Answer 10/20/2018 Week 7: Quiz: Statistics for Decision-Making - 10586 https://devryu.instructure.com/courses/31509/quizzes/96254?module_item_id=3912124 3/19 See text page 301 Ques 2 / 2 pts tion 4 (CO6) From a random sample of 41 teens, it is found that on average they spend 43.1 hours each week online with a standard deviation of 5.91 hours. What is the 90% confidence interval for the amount of time they spend online each week? (41.58, 44.62) Correct! (37.19, 49.01) (31.28, 54.92) (40.58, 45.62) Ques 2 / 2 pts tion 5 (CO6) A company making refrigerators strives for the internal temperature to have a mean of 37.5 degrees with a standard deviation of 0.6 degrees, based on samples of 100. A sample of 100 refrigerators have an average temperature of 37.53 degrees. Are the refrigerators within the 90% confidence interval? No, the temperature is outside the confidence interval of (37.40, 37.60) Yes, the temperature is within the confidence interval of (37.40, 37.60) Correct! 10/20/2018 Week 7: Quiz: Statistics for Decision-Making - 10586 https://devryu.instructure.com/courses/31509/quizzes/96254?module_item_id=3912124 4/19 No, the temperature is outside the confidence interval of (36.90, 38.10) Yes, the temperature is within the confidence interval of (36.90, 38.10) Ques 2 / 2 pts tion 6 (CO6) What is the 97% confidence interval for a sample of 104 soda cans that have a mean amount of 15.10 ounces and a standard deviation of 0.08 ounces? (12.033, 12.067) (15.083, 15.117) Correct! (15.020, 15.180) (15.940, 15.260) Ques 2 /

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