Chapter 5 - Discrete Probability Distributions - 5-3 Binomial Probability Distributions - Basic Skills and Concepts - Page 217: 3

The selections are not independent. They can be treated as independent. The probability can be found by using the binomial probability formula.

The survey was done without replacement, therefore the selections are not independent, but are dependent. We know that there is a 5% guideline for calculations like this and here, 30 is 3% of 1000, 3%<5%, therefore they can be treated as independent. The probability can be indeed found by using the binomial probability formula.