A quality engineer wanted to be 98% confident that the maximum error
of the estimate of the mean strength, μ, of the left hinge on a vanity
cover molded by a machine is 0.25. A preliminary sample of size n=32
_
parts yielded a sample mean of x=35.68 and a standard deviation of
s=1.723
How large a sample is required ?
請問這題怎麼算
題目都看不太懂....
麻煩各位強者了
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