Question 1 A clinic sampled 15 of its patients , based on the sample the standard deviation of patient waiting time Not yet is 4 minutes . Construct a 95% confidence interval for the variance of patient waiting time. answered Marked out of Select one: 1.00 O a. 2.55 to 4.60 Flag question O b. 4 to 15 O c. 8.3 to 40.12 O d. 8.576 to 39.796Question 2 A company wishes to test if advertising expenditures is boosting sales revenue. Regression analysis Not yet was performed between advertising (in hundreds), and sales(in thousands) , the resulting equation :Y= answered 500+4X. If , sales was estimated to be $900, then advertising expenses should have been : Marked out of 1.00 Select one: Flag O a. $100 question O b. $50 O c. $360 O d. $500Question 3 A researcher found the following simple linear regression equation y = 100+30x . Given that sample size Not yet = 15 , SST = 50.01, answered SSR = 35.62 , E(x - x)2 = 12.55 Marked out of 1.00 Calculate the standard deviation (Sb1) Flag question Select one: O a. 0.084 O b. 0.051 O c. 1.05 O d. 0.297Question 4 Given the following table about simple linear regression : Not yet answered EX = 90 E ( Y - Y) (X - X) =-170 Marked out of EY = 340 E (X - X )2 =230 1.00 n = 4 E (Y - Y) 2 = 1974 Flag SSR = 104 question Calculate MSE: Select one: O a. 623 O b. 935 O c. 400 O d. 1870Question 5 Not yet answered Marked Out of 1.00 '7 Flag question Choose the correct statement about the coefficient of determination : Select one: 0 at It is the square root of the correlation coefficient 0 b. It can only be positive 0 c. It is the same thing as the correlation coefficient 0 d. The range of possible value is from -l to l Question 6 Given the following information , obtained from a completely randomized experiment : Not yet Number of treatments (K) = 5 , n, -k = 60 answered Marked out of test statistic F = 5, Sum of squares due to treatment (SSTR) = 200 1.00 Find the Sum of Squares due to error and Mean Sum of squares due to error : Flag question Select one: O a. SSE=200 and MSE=50 O b. SSE=600 and MSE= 10 O c. SSE=600 and MSE=150 O d. SSE=200 and MSE=10Question 7 Given that SST = 500 , SSR= 375. Then the sample correlation coefficient (r) with a positive slope is Not yet equal to : answered Marked out of Select one: 1.00 O a. 0.75 Flag question O b. 0.25 O c. 0.13 O d. 0.87Question 8 Given the following multiple regression equation : y = 100 + 0.5x, + 0.2x2 , where Y : Total expenses , X1: Not yet Salary , and X2 : wealth . If a person has a salary of $3000, and a wealth of $1,250. answered Total expenses would be : Marked out of 1.00 Select one: Flag question O a. $ 1,225 O b. $ 4,250 O c. $ 1,850 O d. $ 1,750Question 9 Given the following regression equation for a sample of 10 observations, Y=3+5X at the 0.05 level of Not yet significance find the confidence interval for the slope given that Sb, = 1.02 . answered Marked out of Select one: 1.00 O a. 2.65 to 8.1 Flag question O b. 1.54 to 6.42 O c. 3.10 to 7.35 O d. 2.65 to 7.35
