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A researcher is interested in the mean amount of time it takes people to complete a...

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Basic Math

A researcher is interested in the mean amount of time it takespeople to complete a personality questionnaire. He selects 40people at random and calculates the mean amount of time to be 20.4min with a variance of 17.64 min2 .

a) Define the parameter of interest.

b) Define the random variable of interest.

c) Name the distribution required to calculate confidenceintervals. (Check the relevant criteria.)

d) Construct a 98% confidence interval for the true mean amountof time.

e) Interpret your confidence interval.

Answer & Explanation Solved by verified expert
3.6 Ratings (360 Votes)
Total sample size 40mean amount of time 204 minvariance s2 1764 min2Here parameter of interest is the average amount of time takento complete a    See Answer
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