G) find a 95% confidence interval for weight at age 30 of a female who weighed 21 pounds at 1 year of age. round your answer to two decimal places. lower limits and upper limits. H) test the claim that the slope b of the population least-square line is positive at the 1% level of significance. round your answer to three decimal places. t= I) find an 80% confidence interval for b and interpret its meaning. round your answer to three decimal places. lower limits and upper limits.

Modern medical practice tells us not to encourage babies to become too fat. Is there a positive correlation between the weight x of a 1-year old baby and the weight y of the mature adult (30 years old)? A random sample of medical files produced the following information for 14 females. x (1b) 19 24 24 20 15 25 y ( lb) 128 127 26 19 129 145 30 130 130 110 115 In this setting we have Ex = 300, Ey = 1789, Ex2 = 6590, Ey2 = 229,629, and Exy = 38,544. (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 answers for least-squares estimates to four decimal places.) 1 x = 21.4285 127.7857 1.2903 = 100 1372 + 1 2903 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). 150 150 140 140 130 130 120 120 0