Need help with Statistics homework

Oct 17th, 2015
Anonymous
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Accounting
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4. A researcher hypothesizes that people who listen to music via headphones have greater hearing loss than those in the general population. On a standard hearing test, the mean is 22.5 (higher scores indicate better hearing). The researcher gave this same test to a random sample of 12 individuals who regularly use headphones. Their scores on the test appear below. Test the null hypothesis at the .05 level of significance. If appropriate (because the null hypothesis is rejected), construct a 95 percent confidence interval for the population mean, based on the sample mean. 16, 14, 20, 12, 25, 22, 23, 19, 17, 17, 21, 20

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