How to Choose the Most Random Survey

The video tutorial addresses a standardized math test question about selecting a random survey sample. It presents a scenario where a grocery store manager wants to determine the average number of items bought by shoppers in the express checkout lane between 5:00 PM and 7:00 PM. The video evaluates four survey plans, explaining why choices A, B, and C are not random, and concludes that choice D, which involves selecting 8 random 10-minute intervals throughout the week, is the best random sample. The tutorial emphasizes understanding randomness in surveys and concludes with encouragement to continue mastering math.

What makes answer choice C not a valid random sampling method?

Describe why answer choice D is the best option for obtaining a random sample.