A private and a public university are located in the same city. For the private university, 1045 alumni were surveyed and 651 said that they attended at least one class reunion. For the public university, 802 out of 1324 sampled alumni claimed they have attended at least one class reunion. Is the difference in the sample proportions statistically significant? (Use α=0.05)

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

Math i have no idea how to do a and b