8. An ornithologist is interested in determining the singing rate of captive male cotingas. When 27...
8. An ornithologist is interested in determining the singing rate of captive male cotingas. When 27 are randomly selected, they have a mean of 33.62 songs per hour and a standard deviation of 15.27 songs per hour.
a. Find the 90% confidence interval.
b. Write a sentence that interprets the confidence interval.
c. Use your answer to part (a) to test the claim that the mean is less than 40 songs per hour.
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