An Internet service provider is interested in testing to see if there is a diffe

Question

An Internet service provider is interested in testing to see if there is a difference in the mean weekly connect time for users who come into the service through a dial-up line, DSL, or cable Internet. To test this, the ISP has selected random samples from each category of user and recorded the connect time during a week period. The following data were collected:

Based upon these data and a significance level of 0.05, which of the following statements is true?

Dial Up DSL Cable 19.2 40.6 39.5 17.7 40 42.3 17.2 41.5 47 18.9 30.5 45.4 26.9 46.8 41.1 22.6 43.2 31.2 39.9 41.9 49.3

Explanation / Answer

Given a=0.05, the critical value is F(0.95, df1=2, df2=18) =3.55 (from F table)

Answer:

All of the above are true.

Mean n Std. Dev 21.96 7 5.291 Dial Up 39.88 5 5.896 DSL 43.29 9 3.315 Cable 35.37 21 10.771 Total

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