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Marketing companies have collected data implying that teenagers in the west coast use more ringtones on...

Marketing companies have collected data implying that teenagers in the west coast use more ringtones on their phones than teenagers in the Midwest do. In one particular study of 40 randomly chosen west coast and midwestern teenagers(20 of each) with phones, the mean number of ringtones for the west coast teenagers was 3.2 with a standard deviation of 1.5. The mean for the midwestern teenagers was 1.7 with a standard deviation of 0.8. Conduct a hypotheses test to determine if the west coast teenagers mean is higher than midwestern teenagers mean. State the distribution to use for the test. What is the value of the test statistic? What is the degrees of freedom of the test, v?

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Answer #1

here distribution is used is :student t

value of the test statistic t =3.946

degree of freedom v =28

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