1-While conducting a survey to find what proportion of the population liked polar bears over penguins, the researchers found that .3515 of the population like polar bears. 1000 people were surveyed for the study. Build a confidence interval for the proportion of the people who liked polar bears over penguins with a 99% confidence level. What is the upper number?

A(.3219, .3811)

B(.32665, 037635)

C(.31262, .39038)

2 The researchers wished to study the population density of penguins in a certain region of the ice shelf by taking the mean number of penguins per acre. They want to build a confidence interval with a confidence level of 95% with a margin of error no more than 4 penguins. They also know that the standard deviation of penguins per acre is 9 penguins. How many acres of penguins should they study?

A-19

B-5

C-379

D-20

3- A person claims that he can beat 80% of the people in a room in a math contest. He faces off against 300 people and beats 216 people. Should we believe his claim or reject his claim? Base your decision off of a 95% confidence interval.

A-We should reject his claim. He lost too much.

B-We should reject his claim. He won too much.

C-We should believe his claim.