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Ten samples of 20 boxes of cereal are weighed, and the means of the samples are...

Ten samples of 20 boxes of cereal are weighed, and the means of the samples are found to vary from 364.4 to 371.9 grams. If ten more samples of 30 boxes each were weighted, which of the following ranges of means would you most likely expect to find among the ten samples, given μ=368 grams and s=15 grams?

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Answer #1

The standard error for n=30 is

15 se-=マ30~2.7

The most likley range is

(368-2.7,368+2.7)=(365.3,370.7)

Answer: (365.3, 370.7)

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