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A random sample of 23 items is drawn from a population whose standard deviation is unknown....

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Statistics

A random sample of 23 items is drawn from a population whosestandard deviation is unknown. The sample mean is x=820 and thesample standard deviation is s=25. (Round all answers to 3 decimalplaces)

(a) Construct an interval estimate of u with 99% confidence

(b) Construct an interval estimate of u with 99% confidence,assuming that s=50

(c) Construct an interval estimate of u with 99% confidence,assuming that s=100

Answer & Explanation Solved by verified expert
3.8 Ratings (735 Votes)
a 99 Confidence Interval X t2 n1 Sn t2 n1 t001 2 23 1 2819 820 t0012 23 1 2523 Lower Limit 820 t0012 23 1 2523 Lower Limit 805305    See Answer
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