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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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