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Among various ethnic groups, the standard deviation of heights is known to be approximately three inches. We wish to construct a 95% confidence interval for the mean height of males from a certain country. Forty-six males are surveyed from a particular country. The sample mean is 72 inches. The sample standard deviation is 2.6 inches.

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n =

(i) State the confidence interval. (Round your answers to two decimal places.)
(iii) Calculate the error bound. (Round your answer to two decimal places.)

Sagot :

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