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

answer:

b

step-by-step explanation:

i believe its b gamer.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.