Need help understanding with sampling design. Questions 1-3

1) A large medical professional organization with membership consisting of doctors, nurses, and other medical employees wanted to know how its members felt about HMOs (health maintenance organizations). Name the type of sampling plan they used in each of the following scenarios: a) They randomly selected 500 members from each of the lists of all doctors, all nurses, and all other employees and surveyed those 1500 members. b) They randomly selected ten cities from all cities in which its members lived, and then surveyed all members is those cities . c) The randomly choose a starting point from the first 50 names in an alphabetical list of members, then chose every 50th member in the list starting at that point. 2) A political scientist surveys 400 voters randomly selected from the list of all registered voters in a community. The purpose is to estimate the proportion of registered voters who will vote in an upcoming election. a) What is the population of interest in this survey? b) What is the sample in this survey? c) What is the parameter of interest in this survey? 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. c) 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