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A manufacturer claims that the mean lifetime, , of its light bulbs is 49 months. The standard deviation of these lifetimes is 9 months. Seventy bulbs are selected at random, and their mean lifetime is found to be 46 months. Can we conclude, at the .01 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 49 months?
Perform a two-tailed test. Then fill in the table below
Round to at least three decimal spaces
1. Hypothesis
2. Null Hypothesis
3. Type of Test Statistic; T Z Chi F
4. The two critical values at the .01 level of significance.
5. Can we conclude that the mean lifetime of the light bulbs made by this manufacture differs from 49 months.
Using the data for women, complete an analysis of CHD incidence in women similar to the one completed for men.
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
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Find the P value or an interval containing the P value for the sample test statistic.
As a result of an increase in demand for a town's parking facilities, the owners of a car park are reviewing their business operations. A decision has to be made to choose one of the following options:
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