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In: Statistics and Probability

Plastic sheets produced by a machine are periodically monitored for possible fluctuations in thickness. If the...

Plastic sheets produced by a machine are periodically monitored for possible fluctuations
in thickness. If the true variance in thicknesses exceeds 2.25 square milimeters, there is
cause for concern about product quality thickness measurements for random sample of 10
sheets produced in a particular shift were taken, giving in following results (in milimeters):
(15 p)
226 226 232 227 225 228 225 228 229 230
Test at the 5 percent significance level the null hypothesis that the population variance is at
most 2.25.

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orchestra answered 2 years ago
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