QUESTION AL A leading E-commerce company conducts a study to observe the weekend sales per customer over 50 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 be RM 65.50 with a 1% level of significance. Compute the value of test statistic. (b) Explain why t-distribution is used for this hypothesis testing.

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