RANDOM SAMPLING, A school principal wants to know the average level of math anxiety among all 1,200 students in the school., A health researcher wants to estimate the percentage of adults in a large city who suffer from chronic back pain., A quality control manager at a factory needs to check if a batch of 10,000 lightbulbs meets safety standards., A national polling organization wants to predict the winner of an upcoming presidential election., A university library wants to find out which academic journals are most frequently used by its 15,000 registered students., An environmental scientist wants to measure the average soil pH level across a massive 500-acre state park., A multinational tech company wants to evaluate customer satisfaction among its 5 million global app users., NON-RANDOM SAMPLING, A psychology student needs to quickly collect data for a class project on sleep habits and decides to interview classmates sitting near them., A medical researcher wants to test a experimental treatment for a rare genetic disease that only affects a few hundred people globally., A marketing firm needs to gather immediate feedback on a new soda flavor and sets up a booth at a local mall to interview whoever walks by., A sociologist investigating the experiences of undocumented immigrants needs to find participants who are willing to speak on a sensitive topic., A magazine editor wants to run a feature story on "the average working mom" and hand-picks five specific mothers who fit a very precise narrative., A news website posts an online poll on its homepage asking readers to vote "Yes" or "No" on a controversial new law., A researcher wants to study the subculture of elite underground street racers in a metropolitan area., A retail store manager wants to interview exactly 25 male shoppers and 25 female shoppers today to get a quick snapshot of holiday shopping habits.

RANDOM VS NON-RANDOM

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