MATH 221 Week 7 Quiz: Statistics for Decision-Making (v1) |TOP RATED PAPER | Already GRADED A+
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Course
MATH 221
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Devry University
MATH 221 Week 7 Quiz: Statistics for Decision-Making (v1) Question: (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 4 .9 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amoun...
question 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 49 hours with a standard deviation of 035 hours what is t
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MATH 221 Week 7 Quiz: Statistics for Decision-Making (v1)
Question 1
pts
(CO6) 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?
Correct!
(5.71, 5.89)
(5.73, 5.87)
(5.72, 5.88)
(5.74, 5.90)
Question 2
pts
(CO6) 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?
1.710
Correct!
0.855
0.428
8.520
Question 3
pts
(CO6) If the standard deviation of a sample decreases without other changes, what is most likely
to happen to the confidence interval?
cannot determine
, does not change
widens
Correct!
narrows
Question 4
pts
(CO6) From a random sample of 41 teens, it is found that on average they spend 31.8 hours each
week online with a standard deviation of 3.65 hours. What is the 90% confidence interval for the
amount of time they spend online each week?
(24.50, 39.10)
(29.99, 33.61)
Correct!
(30.86, 32.74)
(28.15, 35.45)
Question 5
pts
(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 37.37 degrees. Are the refrigerators within the 90%
confidence interval?
Yes, the temperature is within the confidence interval of (36.90, 38.10)
Yes, the temperature is within the confidence interval of (37.40, 37.60)
Correct!
No, the temperature is outside the confidence interval of (37.40, 37.60)
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