Supermarket shoppers were observed and questioned immediately after putting an item in their cart. Of a random sample of 280 choosing a product at the regular price, 173 claimed to check the price before putting the item in their cart. Of an independent random sample of 220 choosing a product at a special price, 163 made this claim. Find a 95 % confidence interval for the difference between the two population proportions
Supermarket shoppers were observed and questioned immediately after putting an item in their cart. Of a...
In a marketing survey, a random sample of 1000 supermarket shoppers revealed that 272 always stock up on an item when they find that item at a real bargain price. (a) Let p represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate for p. (Enter a number. Round your answer to four decimal places.) (b) Find a 95% confidence interval for p. (For each answer,...