QUESTION Al [5 marks} A leading Ecommerce company conducts a study to observe the weekend sales per customer over St} years old is RM 5000. Based on the sample of 26 customers who were randomly selected, statistics show the mean spent for weekend sales is only RM 4200. The standard deviation of the sample is known to he RM 65 .50 with a 1% level of signicance. (a) Compute the value of test statistic. (3 marks} (b) Explain why tdistribution is used for this hypothesis testing. {2 marks) Question A2 and A3 relate to the following information. A study was conducted among 241 university students to determine the time spent on revision that impacts their CGP'A. The table shows the result of the study according to the 241 observed students with expected numbers. CGPA