A company wanted to know if attending a course on "how to be a successful salesperson" can increase the average sales of its employees. The company sent six randomly selected salespersons to attend this course. The following table gives the 1 week sales of these salespersons before and after they attended the course. Calculate the difference (d)and find d. Using a 5% level of significance can you conclude that the mean weekly sales for all salespersons increase as a result of attending this course? Assume that the population of paired differences has a normal distribution. Fill in table below to find the differences. Salesperson Sales Before attending course (1) Sales After attending course (A) d=(A-B) HH 0 a: 0.10 8. H: = H H: H> H a: 0.01 CH d=0 H: do a: 0.01 (2) M: # f) Calculate d, the mean difference for this sample (2 decimal places): 8) Calculate the test statistic for the sample using your calculated average difference (d) and 5 - 3.559 and locate on the chosen sketch. (show your formula and work to 2 decimal places) h) Using the critical region method, based on your calculation in the previous question do you reject or fail to reject the null hypothesis? Interpret your conclusion in context of the problem: At % level of significance, (reject or fail to reject). the null hypothesis. There is (sufficient or insufficient). evidence to claim that the mean weekly sales increased after attending the course.