Suppose the company decided to allow the sales representatives to choose whether to participate in the field-training program or to opt out. There are 400 who have chosen to participate in the field-training program and 600 who have opted out of the program. How might the self-selection process affect the statistical validity of the comparison of the change in the proportion of sales orders from new stores? Support your answer with a specific example.

you would only be able to have 200 people from each region train. this would lower the percentage of the impact the training had on the amount of sales ( if any) . For example, if the original 250 trained people in a region increased the sales in that region by 20 percent and 50 of those people ended up not actually training, the sales would have only increased by 16 percent.

Step-by-step explanation: