Find a 92.9% confidence interval for the difference p1−p2p1−p2 of the population proportions.
Hint: For a level of confidence (1−α)⋅100%(1−α)⋅100%, z∗z∗ is the value that leaves an area of (1−α)/2(1−α)/2 to its right in a standard normal distribution
So 2/7 cookies on Monday n 1/3 more on Tuesday so we are going to fine Tuesday's amount , to find what fraction did Gail sell on the two days so 2/7 + 1/3 find lCM which is 21
u add and get 13/21
so
31/21+2/7=19/21
