A rods manufacturer makes rods with a length that is supposed to be 10

inches. A quality control technician sampled 39

rods and found that the sample mean length was 10.09

inches and the sample standard deviation was 0.19

inches. The technician claims that the mean rod length is more than 10

inches.

What type of hypothesis test should be performed?

What is the test statistic?

What is the number of degrees of freedom?

Does sufficient evidence exist at the =0.01

significance level to support the technician's claim?

Select

Two-tailed z-test

Left-tailed z-test

Left-tailed t-test

Right-tailed t-test

Select

Yes

No

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