1. (10 points) Another day, another dollar. You wake up on a brisk Saturday morning to go to your job at the local grocery store (back at it again). Your boss, not wanting to hear your passionate ramblings regarding categorical and quantitative variables, puts you on the register. So off you go to register 7, while your arch nemesis, Tammy, is on register 8. This unspoken rivalry burns strong in your heart, so being the statistical person you are, you decide to do some hypothesis testing to determine if there is any difference in Tammy's register efciency and the population of all workers in this grocery store chain. According to the latest company newsletter, the average number of customers rung up in a 30-minute period by employees was u = 10.5, o = 5.5. Tammy's average number of customers rung up in a 30-minute period on 81 different occasions (n= 81) was M= 8.6. Conduct a one sample 2 test to determine whether you should retain or reject the null hypothesis with (1 : 0.05. Calculate Cohen's d and indicate the strength of the effect size (small, medium, or large). Use the back of this page to conduct your z test Step 1 : Step 2: Step 3: Step 4: Cohen's d (and its strength)