A 90 confidence interval for the mean load required to pull

A 90% confidence interval for the mean load required to pull apart pieces of Douglas fir, is \"29,737.5 to 31,944.5\". Use this interval to answer the following questions:

1) Is there significant evidence at the = 0.10 level against the hypothesis that the mean is 29,500 pounds for the two-sided alternative?

2) in a statistical test of hypotheses, we say the data are statistically significant at level if:

Solution

1.

As we can see, 29500 is not inside the interval.

OPTION B: Yes, because the value 29,500 is not included in the confidence interval. [ANSWER, B]

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2.

By defintion,

OPTION C: the P-value is less than . [ANSWER, C]

[In this case, we say that the result is \"rare enough\" so that it didn\'t happen by just chance.]