13. In a random sample of 200 school district residents, 94 stated they are in favor of starting the school day 15 minutes later each day.
(a) Show that the conditions for calculating a confidence interval for a proportion are satisfied.
(b) What is the margin of error for a 90% confidence interval?

Find the product of (4x + 3y)(4x − 3y). 16x2 − 24xy + 9y2 16x2 − 9y2 16x2 + 24xy + 9y2 16x2 + 9y2

3382-299=3383- ? fill in the blank?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.