MATH 221 Week 5 Quiz: Statistics for Decision-Making {100% correct answers}
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Course
MATH 221
Institution
DeVry University, Chicago
Question: (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 t he 95% confidence interval for the amount of time spent on personal issues? Question: (CO 4) If a ...
question 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 58 hours with a standard deviation of 035 hours what is t
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DeVry University, Chicago
MATH 221
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MATH 221 Week 5 Quiz
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 is the 95%
confidence interval for the amount of time spent on personal issues?
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?
, Question 5
(CO 4) A company making refrigerators strives for the internal temperature to have a mean of 37.5
degrees with a population standard deviation of 0.6 degrees, based on samples of 100. A sample of 100
refrigerators have an average temperature of 37.37 degrees. Are the refrigerators within the 90%
confidence interval?
Yes, the temperature is within the confidence interval of (37.40, 37.60)
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)
No, the temperature is outside the confidence interval of (37.40, 37.60)
Question 5
(CO 4) A company making refrigerators strives for the internal temperature to have a mean of 37.5
degrees with a population standard deviation of 0.6 degrees, based on samples of 100. A sample of 100
refrigerators have an average temperature of 37.70 degrees. Are the refrigerators within the 90%
confidence interval?
Yes, the temperature is within the confidence interval of (37.40, 37.60)
No, the temperature is outside the confidence interval of (37.40, 37.60)
Yes, the temperature is within the confidence interval of (36.90, 38.10)
No, the temperature is outside the confidence interval of (36.90, 38.10)
Question 6
(CO 4) What is the 97% confidence interval for a sample of 104 soda cans that have a mean amount of
12.05 ounces and a population standard deviation of 0.08 ounces?
Question 6
(CO 4) What is the 97% confidence interval for a sample of 204 soda cans that have a mean amount of
12.05 ounces and a population standard deviation of 0.08 ounces?
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