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5. (5.6; 709462) QUESTION 8 A supplier of a household disinfectant liquid launched a promotional ca of its 500 ml bottles, before the campaign, the average weekly sales at 12 randomly chosen retail outlets throughout Kwazulu-natal. Thre average weekly sales were again recorded at the same 12 outlets cases sold) are shown for each of the 12 retail outlets as follows: paign to increase sales (in cases sold) were recorded e weeks after the campaign, (in . The average weekly sales Sales (in cases) Outlet Before After 12 14 14 13 15 10 11 12 16 13 9 10 10 13 14 13 11 12 12 10 Can the suppliers of the Household disinfectant conclude that the promotional campaign has been a success? Which one of the following statements is incorrect? 1. This is a matched-pairs test. 2. Ho : 0 vs H1 : μDt0. 3, The critical value at 5% level of significance is 2, 201. 4. The 95% confidence interval for the differences between the sales is (-1.45, 0.12) 5. If zeros lies between two interval limits, Ho is not rejected.

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Statement 1. Incorrect Correct Answer: This is Paired t-test Statement 2. Incorrect Correct Answer: Ho: μD-0 Vs H1: μD#0 Statement 3. Incorrect Correct Answer: The critical value at 5% level of significance is 2.201 Statement 4. Correct. The 95% confidence interval for the difference in shown below table, Paired Samples Test Paired Differences | Std. Error | t dfSig. (2 tailed) Mean | Std. DeviationMean 95% Confidence Interval of the Difference werUpper Pair before sale - 1after sale 6671.231 .12187611 355 1.45 087 Statement 5. Correct

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