In a survey conducted by 3 polling company. 1100 adult Americans were asked how

Question

In a survey conducted by 3 polling company. 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results. a 95% confidence interval for the mean number of hours worked had a lower bound of 42.7 and an upper bound of 44 5. Provide two recommendations for decreasing the margin of error of the interval. Select all that apply. Increase the confidence level. Decrease the sample size. Decrease the standard deviation of hours worked. Decrease the confidence level. Increase the sample size. Use fewer degrees of freedom. In a survey conducted by 3 polling company. 1100 adult Americans were asked how many hours they worked in the previous week. Based on the results. a 95% confidence interval Select all that apply. Increase the confidence level. Decrease the sample size. Decrease the standard deviation of hours worked. Decrease the confidence level. Increase the sample size. Use fewer degrees of freedom.

Explanation / Answer

n = 1100
Z = 1.96 for 95% CI
LB = 42.7
UB = 44.5

To decrease the MOE one must:

1. False. This would increase the CI
2. False. Same as above
3. True.
4. True. Adjusting for lower confidence would decrease the MOE
5. True. For a larger sample size, the MOE will decrease
6. False. Fewer degrees of freedom will decrease the n, thereby increaseing the MOE

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