Acompany sells hockey sticks. members of the company's research group would like to estimate the percentage of their customers who are left-handed. they plan to survey a sample of customers. which method should the members use to select the sample?
a. select the next 45 customers who place an order
b. randomly select 45 customers from a list of all customers
c. select the next 45 customers who place an order and are left-handed
d. randomly select 45 customers from a list of customers who have purchased left-handed hockey sticks