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If it is claimed: the contents of soaps boxes sold weigh on average at least 20 ounces. distribution of weight is known to be normal;
If it is claimed: the contents of soaps boxes sold weigh on average at least 20 ounces.
distribution of weight is known to be normal;
We assume\sigma = 0.5
=0.5is known
n=30
sample mean weight = 18.5 ounces.
Test at the 10% significance level(\alpha = .10)
(=.10)the null hypothesis that the population mean weight is at least 20 ounces.
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