C) find the sample correlation coefficient r and the coefficient of determination. round your answer to three decimal places. r= and r^2= D) what percentage of variation in y is explained by the least-square model? round your answer to one decimal places. E) test the claim that the population coefficient p is positive at the 1% level of significance. round your answer to three decimal places. t= F) in a week during which Dorothy makes 16 visits, how many people do you predict will buy insurance from her. round your answer to one decimal places. G) find se. round your answer to three decimal places. H) find a 95% confidence interval for the number of sales Dorothy would make in a week during which she made 16 visits. round your answer to one decimal places. lower limits and upper limits I) test the claim that the slope b of the population least-square line is positive at the 1% level of significance. round your test statistics to three decimal places. t= J) find an 80% confidence interval for b and interpret its meaning. round your answer to three decimal places. lower limits and upper limits

Paused Dorothy Kelly sells life insurance for the Prudence Insurance Company. She sells insurance by making visits to her clients homes. Dorothy believes that the number of sales should depend, to some degree, on the number of visits made. For the past several years, she kept careful records of the number of visits (x) she made each week and the number of people (y) who bought insurance that week. For a random sample of 15 such weeks, the x and y values follow. 14 D 22 7 CO am LON Co m 10 In this setting we have Ex = 248, Zy = 97, Ex2 = 4876, Ey? = 755, and Exy = 1839. (a) Find x, y, b, and the equation of the least-squares line. (Round your answers for x and y to two decimal places. Round your least-squares estimates to four decimal places.) V = b = = X (b) Draw a scatter diagram displaying the data. Graph the least-squares line on your scatter diagram. Be sure to plot the point (x, y). O 10 2:31 4/26/ 30 25