answer all questions with explanation

I) For a sample of 74 monthly observations the regression of the percentage return on gold (y) against the percentage change in the consumer price index (1:) was estimated. The sample regression line. obtained through least squares. was as follows: y= -0.003 + H Ix The estimated standard deviation of the slope of the population regression line was 2.3 l. a) What is the effect on the return on gold if consumer price index increases by 2%? b) Is there any way to improve this model? c) What is the predicted percentage return on gold if consumer price index is 3.2%