Mathematics > QUESTIONS & ANSWERS > MATH221 Week 7 Quiz BEST FOR REVISION (All)

MATH221 Week 7 Quiz BEST FOR REVISION

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Question 1 (CO 4) From a random sample of 55 businesses, it is found that the mean time that employees spend on personal issues each week is 5.8 hours with a standard deviation of 0.35 hours. What i s ... the 95% confidence interval for the amount of time spent on personal issues? (5.74, 5.90) (5.71, 5.89) (5.73, 5.87) (5.72, 5.88) Question 1 (CO 4) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is 5.8 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? (5.74, 5.90) (5.71, 5.89) (5.73, 5.87) (5.72, 5.88) Question 2 (CO 4) If a confidence interval is given from 8.52 to 10.23 and the mean is known to be 9.375, what is the margin of error? 0.428 1.710 8.520 0.855 Question 3 (CO 4) Which of the following is most likely to lead to a small margin of error? large sample size small mean small standard deviation large maximum error Question 4 (CO 4) From a random sample of 85 teens, it is found that on average they spend 31.8 hours each week online with a population standard deviation of 5.91 hours. What is the 90% confidence interval for the amount of time they spend online each week? (30.62, 32.99) (19.98, 43.62) (30.75, 32.85) (25.89, 37.71) [Show More]

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