Match each of the following to the type of sampling technique used: - The researchers list all of the heart attack patients and measure the cholesterol level of every 25th person on the list. - The researchers go to one hospital on a given day and measure the cholesterol level of the heart attack patients at that time. - The researchers divide the heart attack patients based on race, and then measure the cholesterol levels of randomly selected patients in each race grouping. - The researchers randomly select 5 hospitals in the U.S. then measure the cholesterol levels of all the heart attack patients in each of those hospitals. - The researchers list all of the heart attack patients. They then measure the cholesterol levels of randomly selected patients. simple random sample systematic sample convenience sample cluster sample stratified sample