The manager in For Example: “The distribution of a sample proportion of retail customers”
also examines the amount spent by customers using the self-checkout stations.
He finds that the distribution of these amounts is unimodal but skewed to the high end
because some customers make unusually expensive purchases. He finds the mean spent
on each of the 60 days studied and makes a histogram of those values.
QUESTIONS:
1. What shape would you expect for this histogram?
2. If, instead of averaging all customers on each day, the manager selects the first 10 for
each day and just averages those, how would you expect his histogram of the means
to differ from the one in (1)?