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Consider a population with a known standard deviation of 13.6. In order to compute an interval...

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Statistics

Consider a population with a known standard deviation of 13.6.In order to compute an interval estimate for the population mean, asample of 40 observations is drawn. [You may find it useful toreference the z table.]

a. Is the condition that X− is normally distributed satisfied?Yes No

b. Compute the margin of error at a 99% confidence level. (Roundintermediate calculations to at least 4 decimal places. Round \"z\"value to 3 decimal places and final answer to 2 decimalplaces.)

c. Compute the margin of error at a 99% confidence level basedon a larger sample of 240 observations. (Round intermediatecalculations to at least 4 decimal places. Round \"z\" value to 3decimal places and final answer to 2 decimal places.)

d. Which of the two margins of error will lead to a widerconfidence interval?

99% confidence with n = 40.

99% confidence with n = 240.

Answer & Explanation Solved by verified expert
4.4 Ratings (912 Votes)
Solution Given thatPopulation standard deviation 136a Yes A population with a    See Answer
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