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tstat = 2.190; P-value = 0.02; Do not reject Ho. QUESTION 2 There is a strong linear correlation between the advertisement and sales. The marketing department expert at All Brand Shoes store in Dubai has calculated the equation of linear regression between the advertising expenditures, X (Dh1000s) and the revenue (Dh1000s) as following: Y = 98.781 + 1.548X The value 98.781of the Y-intercept in the equation can be interpreted as As advertising is increased by 1.548 Dhs, sales are expected to increase by 98.781 Dhs. As advertising is increased by 1,000 Dhs, Atales are expected to increase by 98,781 Dhs. When nothing is spent on advertising, the sales are expected to reach 98,781 Dhs. The variation of the amounts of the sales and the advertising expenditure is 98.781%. QUESTION 3 According to a news media, the mean monthly salaries of IT workers in Dubai is at least AED 27,000. If you decide to test this claim, how would you write your null and alternative hypotheses? HO: H = 27,000 H1: H #27,000 Ho: H 2 27,000 H1: H 2 1 3 r 4 E 5 0 8 AThere is a strong linear correlation linear regression between the advertising expenditures, X (Dh1000s) and the revenue (Dh1000s) as following: Y = 98.781 + 1.548X The value 98.781of the Y-intercept in the equation can be interpreted as As advertising is increased by 1.548 Dhs, sales are expected to increase by 98.781 Dhs. As advertising is increased by 1,000 Dhs, sales are expected to increase by 98,781 Dhs. When nothing is spent on advertising, the sales are expected to reach 98,781 Dhs. . The variation of the amounts of the sales and the advertising expenditure is 98.781%. QUESTION 3 According to a news media, the mean monthly salaries of IT workers in Dubai is at least AED 27,000. If you decide to test this claim, how would you write your null and alternative hypotheses? Ho: H = 27,000 H1: H # 27,000 Ho: H 2 27,000 H1: H 27,000 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Sa F1 F2 GO F3 F4 F5 F6 F7 FB E # $ % * 2 1 3 r 4 E 5 0 8 Ar = 0.811 QUESTION 10 Credit card balances of all customers in a certain bank is normally distributed. To estimate the mean balance for all customers, a business statistics student has selected 23 customers and found out that their mean balance is Dh4, 185 and the sample standard deviation of Dh655. Find the upper limit of the 99% confidence interval to estimate the mean balance for all customers. Round the answer to the nearest integer. 3780 3833 0 4537 4570 QUESTION 11 Following scatter plot represents a sample of paired X and Y values. Y ck Save and Submit to save and submit. Click Save All Answers to save all answers. Sa F5 F6 F7 FB F1 F2 F4 @e E # $ % * 2 Y 4 5 0 8 9 3 r
