3) Suppose there are 200 teachers at PWSH. Mrs. King wants to perform a survey to find information about teachers' opinions of teaching 6 out of 7 periods. She comes to AP Statistics for help. a) Explain how to select
20 teachers using an SRS. b) Explain how to select 20 teachers using a stratified random sample. c) Explain
how to use a systematic random sample to select the 20 teachers. d) She decides to stop the first 20
teachers that she sees in the foyer. Explain why this would not be a good idea.