1. (5 pts) If a 95% confidence interval is computed on ul and a 99% confidence interval is computed on p2 then the confidence associated with the two intervals both covering their respective parameters is equal to at least 2. (6 pts) Circle all items below that increase the width of a confidence interval on B, from a simple linear regression: ~ a. Increased confidence level - b. Increased variability among X values c. Decreased sample sized 3. (6 pts) An experimenter has the following 4 (x y) measurements: (0, 0.1), (2,3.5), (4, 14.1), (6, 38.2). ~ a. Write the X-matrix corresponding to these data points if the experimenter wants to fit the model;- E(Y) = B1 X + B2 X2 b. Compute X'X