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A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a standard deviation of 3.5 percent.
At the .05 significance level, can we conclude that there is more variation in the oil stocks?
Ho : σ1² ≤ σ2² H1 : σ1² > σ2²
The test statistic is (Round your answer to 2 decimal places.)
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In hypothesis testing when is a two-tail test used in lieu of a one-tail test?
At a used-book sale, 100 books are adult books and 160 are children's books. Of the adult books, 70 are nonfiction while 60 of the children's books are nonfiction. If a book is selected at random, find the probability that is is:
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