A store is conducting a customer satisfaction survey. Which of the following would most likely lead to a biased sample?

selecting random customers at the checkout

selecting female customers who purchase an item

selecting every fourth customer who comes into the store

selecting 100 customers from a customer list at random

selecting female customers who purchase an item

The option that would most likely lead to a biased sample is "selecting female customers who purchase an item." This is because it limits the sample to only female customers, which may not represent the entire customer population accurately. To obtain an unbiased sample, it is important to select customers randomly or systematically without any specific characteristics or criteria.