Question

a restaurant owner wants to gauge customer satisfaction. she surveys the first 15 customers who visit on a tuesday afternoon, asking them to rate their dining experience from 1 to 10. the average score is 9.2, leading her to believe all her customers are highly satisfied. her conclusion is: accurate valid, as the customers were randomly selected biased because she owns the restaurant invalid, as the sample was chosen for convenience

Explanation:

The sample was chosen for convenience (the first 15 customers on a Tuesday afternoon). This is a convenience sampling method, which may not be representative of all customers (e.g., customers on other days, at other times may have different satisfaction levels). Just because the first 15 on a particular day have a high average score doesn't mean all customers are highly satisfied. The sample is not randomly selected in a way that would represent the entire customer population.

Answer:

Invalid, as the sample was chosen for convenience.