A researcher captured, tagged, and released 50 squirrels in a park. She later captured 40 squirrels and found that 8 of them were tagged Estimate the squirrel population size in the park, show your work.

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.