The breaking strengths of cables produced by a certain manufacturer have a mean, u, of 1775 pounds, and a standard deviation of 95 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 20 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1796 pounds. Assume that the population is normally distributed. Can we support, at the 0.1 level of significance, the claim that the mean breaking strength has increased? (Assume that the standard deviation has not changed.) Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. The null hypothesis: Н Н The alternative hypothesis: 口Sロ The type of test statistic: (Choose one) ロロ O

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The breaking strengths of cables produced by a certain manufacturer have a mean, u, of 1775 pounds, and a
standard deviation of 95 pounds. It is claimed that an improvement in the manufacturing process has
increased the mean breaking strength. To evaluate this claim, 20 newly manufactured cables are randomly
chosen and tested, and their mean breaking strength is found to be 1796 pounds. Assume that the
population is normally distributed. Can we support, at the 0.1 level of significance, the claim that the mean
breaking strength has increased? (Assume that the standard deviation has not changed.)
Perform a one-tailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal places, and round your responses as
specified in the table.
The null hypothesis:
Н
Н
The alternative hypothesis:
口Sロ
The type of test statistic:
(Choose one)
ロロ
O<O
The value of the test
statistic:
(Round to at least three
decimal places.)
The critical value at the
0.1 level of significance:
(Round to at least three
decimal places.)
Can we support the claim that the mean
Yes
O No
breaking strength has increased?
の
Transcribed Image Text:The breaking strengths of cables produced by a certain manufacturer have a mean, u, of 1775 pounds, and a standard deviation of 95 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 20 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1796 pounds. Assume that the population is normally distributed. Can we support, at the 0.1 level of significance, the claim that the mean breaking strength has increased? (Assume that the standard deviation has not changed.) Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. The null hypothesis: Н Н The alternative hypothesis: 口Sロ The type of test statistic: (Choose one) ロロ O<O The value of the test statistic: (Round to at least three decimal places.) The critical value at the 0.1 level of significance: (Round to at least three decimal places.) Can we support the claim that the mean Yes O No breaking strength has increased? の
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