Answer to Question #226057 in Statistics and Probability for Carrie

Question

The data is shown in table below

Period 1 70 85 64 83 68 91 65 78 96 92

Period 2 72 84 68 88 68 95 64 76 102 94

Suppose that Telkom’s internet marketing manager asked the question: Is the internet usage in-

creasing? To answer to this question, a statistics practitioner wants to conduct a hypothesis test,

at the 5% significance level to determine if the monthly internet usage per user has increased

significantly from period 1 (March last year) to period 2 (March this year).

Which one of the following statements is incorrect?

1. This is a matched-pairs hypothesis test because the two samples period 1 and period 2 are

drawn from the same subscribers.

2. The hypotheses are H0 : D  0 vs H1 : D > 0:

3. The degrees of freedom d f is 9:

4. The 95% confidence interval for matched-pairs samples is .