4. A sales manager collected the data on annual sales (y, in $10,000s) for customers and the number of years of experience (x, in years) for a sample of 15 salespersons. The statistical information of the data as below,
申論題內容
b. According to the information above, at a 0.05 level of significance, test for the claim “longer the years of experience, more the annual sales.”. (6%)