Quiz na (a) A manufacturing company produces bearings. One line of bearings is specified to be 2.55 centimeters (cm) in 1 2 it of diameter, A major customer requires that the variance of the bearings be no more than 0.01 cm2. The producer is required to test the bearings before they are shipped, and so the diameters of 18 bearings are measured with a Finish att precise instrument, resulting in the following values. Assume bearing diameters are normally distributed. Use the data and a = 0.05 to test the data to determine whether the population of these bearings is to be rejected because Time left of too high a variance (C V - 2.58) 2.49 2.55 2.53 2.58 2.50 2.52 2.55 2.48 2.50 2.56 2.51 2.55 2.49 2.55 2.55 2.53 2.57 2.55 (b A marketing manager wants to determine the relationship between the price per dose of prescription drugs in the United States and the price of the same dose in Australia, The data are shown. U.S price (x) 3.31 3.17 2.12 4.15 2 54 1 98 2.22 Australian price 1.29 1 75 0.82 0.83 1.32 0.84 10.82 Draw a scatter plot and compute the correlation coefficient. Determine the regression line equation. ili) Calculate the coefficient of determination and also interpret it (iv) Test the significance of regression coefficient at a=0.05. (Critical value =2 201)