A random sample of 82 college students were asked how many hours do they exercis

Question

A random sample of 82 college students were asked how many hours do they exercise in a typical week. The data was entered in the Statistix software and the descriptive statistics printouts is shown below:

Descriptive Statistics

Exercise
N 82
Lo 93% CI 6.0925
Mean 6.9878
Up 93% CI 7.8831
SD 4.4152
Minimum 0.0000
Median 6.5000
Maximum 22.000

Suppose it is desired to reduce the width of the confidence interval to get more accurate information. Which of the following will accomplish this goal?

Explanation / Answer

The specifies goal will be achieved If we decrease reliability level.

Justification - because when we decrease reliability more number of observations are falling in the bucket and interval become narrower as larger the sample size better the estimate of the mean .

Hence, if we decrease reliability level then width of interval get reduced.

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