QUESTION 4 A random sample of 10 home internet users was selected from Telkom's database and their monthly internet usag

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Question 4 A Random Sample Of 10 Home Internet Users Was Selected From Telkom S Database And Their Monthly Internet Usag 1 (86.51 KiB) Viewed 47 times

Question 4 A Random Sample Of 10 Home Internet Users Was Selected From Telkom S Database And Their Monthly Internet Usag 2 (61.78 KiB) Viewed 47 times

QUESTION 4 A random sample of 10 home internet users was selected from Telkom's database and their monthly internet usage (in hours) was identified for March last year (period 1) and again for March this year (period 2). The data is shown in table below Period 1 70 85 64 83 6891 Period 2 72 84 68 88 6895 6578 64 76 96 92 102 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 Ho: ID < 0 vs H > 0. 3. The degrees of freedom df is 9. 4. The 95% confidence interval for matched-pairs samples is (-3.908 ; 0.108). 5. The test statistic 1 = 21.407.

QUESTION 6 After a recent AIDS awareness campaign, the department of National Health commissioned a market research company to conduct a survey on its effectiveness. Their brief was to establish whether the recall rate of teenagers differed from that of young adults (20 - 30 years of age). The market research company interviewed a random sample of 640 teenagers and 420 young adults. It was found that 362 teenagers and 260 young adults were able to recall the AIDS awareness slogan of "AIDS: don't let it happen". The management wants to test, at the 5% level of significance, the null hypothesis Ho : There is an equal recall rate between teenagers and young adults. The test statistic is 1. 0.0316 2. -2.0163 3. 1.6906 4. -1.6906 5. 16.9870