General motors wants to administer a satisfaction survey to its current customers. using their customer database, the company randomly selects 30 customers and asks them about their level of satisfaction with the company. what type of sampling is used? cluster convenience simple random systematic stratified

Simple random

Step-by-step explanation:

Since , the company randomly selects customers and asks them about their level of satisfaction with the company.

So the chances for each customer to get selected are equal.

This technique of sampling is known as simple random sampling .

Definition:

Here , the probability for each individual to get selected is equal as , where N = Population size.

In the rest of sampling method (convenience , systematic , stratified and cluster) , the individuals in the population do not have equal chances to get selected. .

the answer will be b x² +x-1

step-by-step explanation: