QUESTION TWO (20 MARKS) a) What factors determine the width of a confidence interval for a mean? (3 marks) b) Why is an interval estimate better than a point estimate? (3 marks) c) A Curry Puff Seller wants to estimate the mean amount spent by customers. Their store's budget limits the number of surveys to 225. What is their maximum error of the estimated mean amount spent for Curry Puff for a 99% level of confidence and an estimated standard deviation of RM10.00? (7 marks)