The sampling distribution of (P a- P b) will not be normal, because we expect fewer than 10 customers who do not want to order tickets digitally in both samples.
Not normal, because we expect fewer than 10 customers who do not want to order tickets digitally in both samples.
Explanation: Khan Answer
10% of customers in July would not want to order tickets digitally because 90% do. In an SRS of 70 customers, that means only 7 would not want to order tickets digitally. 13% of customers in August would not want to order tickets digitally because 87% do. In an SRS of 70 customers, that means only 9.1 would not want to order tickets digitally. Because both of these counts are less than 10, we can not assume normality.
