12. In any bottling process, a manufacturer will lose money if the bottles contain either more or less than is claimed on the level. Accordingly, bottlers pay close attention to the amount of their prcduct being dispensed by bottle-filling machines. Suppose that a quality control inspector for a catsup company is interested in testing whether the mean number of ounces of catsup per family-size bottle differs from the labeled amount of 20 ounces. The inspector samples 9 bottles, measures the weight of their contents, and finds that x = 19.7 ounces and s 0.3 ounce. (a) Write the test statistic and compute its value. Compare the value of the test statistic with the critical value of the test at a = 0.05 for testing whether sample evidence indicates any necessity for the adjustment of catsup dispensing machine. (b) What is the p-value for the hypothesis test you conducted in part (a)? (c) What assumptions are necessary so that the test procedure used in part (a) is valid? (d) Find a 90t confidence interval for the mean number of ounces catsup being dispensed?

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12. In any bottling process, a manufacturer will lose money
if the bottles contain either more or less than is
claimed on the level. Accordingly, bottlers pay close
attention to the amount of their prcduct being dispensed
by bottle-filling machines. Suppose that a quality
control inspector for a catsup company is interested in
testing whether the mean number of ounces of catsup per
family-size bottle differs from the labeled amount of 20
ounces. The. inspector samples 9 bottles, measures the
weight of their contents, and finds that x = 19.7
ounces and s 0.3 ounce.
(a) Write the test statistic and compute its value. Compare
the value of the test statistic with the critical value
of the test at a = 0.05 for testing whether sample
evidence indicates any necessity for the adjustment of
catsup dispensing machine.
(b) What is the p-value for the hypothesis test you
conducted in part (a)?
(c) What assumptions are necessary so that the test
procedure used in part (a) is valid?
(d) Find a 90t confidence interval for the mean number of
ounces catsup being dispensed?
Transcribed Image Text:12. In any bottling process, a manufacturer will lose money if the bottles contain either more or less than is claimed on the level. Accordingly, bottlers pay close attention to the amount of their prcduct being dispensed by bottle-filling machines. Suppose that a quality control inspector for a catsup company is interested in testing whether the mean number of ounces of catsup per family-size bottle differs from the labeled amount of 20 ounces. The. inspector samples 9 bottles, measures the weight of their contents, and finds that x = 19.7 ounces and s 0.3 ounce. (a) Write the test statistic and compute its value. Compare the value of the test statistic with the critical value of the test at a = 0.05 for testing whether sample evidence indicates any necessity for the adjustment of catsup dispensing machine. (b) What is the p-value for the hypothesis test you conducted in part (a)? (c) What assumptions are necessary so that the test procedure used in part (a) is valid? (d) Find a 90t confidence interval for the mean number of ounces catsup being dispensed?
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