Use the following to answer the question(s) below.
IT staff for a large corporation has developed the following probability distribution for the number of calls requiring troubleshooting problems per day.

-After computing a confidence interval, the investigator believes that the results are meaningless because the width of the interval is too large. In reconstructing the interval, the investigator should
A) decrease the sample size.
B) increase the level of confidence.
C) increase the sample size.
D) reduce the population variance.
E) increase the margin of error.

Question

Use the following to answer the question(s) below.
IT staff for a large corporation has developed the following probability distribution for the number of calls requiring troubleshooting problems per day.

-After computing a confidence interval, the investigator believes that the results are meaningless because the width of the interval is too large. In reconstructing the interval, the investigator should
A) decrease the sample size. 
B) increase the level of confidence. 
C) increase the sample size. 
D) reduce the population variance. 
E) increase the margin of error.

Quizplus · Accepted Answer

Increasing the sample size will reduce the width of the confidence interval, making the results more meaningful. Decreasing the sample size or increasing the margin of error would only increase the width of the interval, making the results even less meaningful. Increasing the level of confidence would also increase the width of the interval, but it would also increase the level of certainty in the results. Finally, reducing the population variance would not have a direct impact on the width of the interval.

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