My answers are in bold. I know there is a document already uploaded with answers but I don't believe they are right. Thanks!

My answers are in bold. I need help with the sign test and calculating probability. I know there is a document already uploaded with answers but I don't believe they are right. Thanks!

13. (5 points) A company has just switched to a 4-day work week. It has measured the number of units produced per week for 10 employees before and after the change. Does the change impact production. Show your work.