Please help! The owner of a nationwide chain of shopping malls is interested in the buying habits, on any given day, of the people who shop at the malls. Which sentence
describes the best sample the owner could use to make inferences about the population?
Choose one shopping mall from the chain and survey all the people who shop there every day of the week
Choose one shopping mall from the chain and survey the managers of the three largest stores about the habits of the people who shop in their stores.
Randomly select a sample of shopping malls from the chain throughout the nation and survey a random sample of the people who shop at the mail on Friday,
Randomly select a sample of shopping malls from the chain throughout the nation and survey a random sample of the people who shop at the mal each day of the week