1. Pleaseuse the following information to answerquestions 1a-1c:

A population has a standard deviation of = 20.

1a. How large a sample is necessary to have a standard error that is less than or equal to 5 points (MUST SHOW WORK FOR THIS PROBLEM)?

Group of answer choices

n 16

n 16

n 25

n 25

1b. How large a sample is necessary to have a standard error that is less than or equal to 2 points (MUST SHOW WORK FOR THIS PROBLEM)?

Group of answer choices

n20

n20

n 100

n 100

1c. How large a sample is necessary to have a standard error that is less than or equal to 1 point (MUST SHOW WORK FOR THIS PROBLEM)?

Group of answer choices

n 20

n 20

n 400

n 400