Suppose the Rotary club was planning to survey 2000 of its members primarily to determine the percentage of its membership that currently owe more than one car.
a) Describe both the population and the sample of interest to the club.
b) Describe the type of data that the club primarily wishes to collect.
Develop a questionnaire needed by writing a series of five categorical questions and five numerical questions that you feel would be appropriate for this study.
Answers
Answer:
What are sampling methods?
In a statistical study, sampling methods refer to how we select members from the population to be in the study.
If a sample isn't randomly selected, it will probably be biased in some way and the data may not be representative of the population.
There are many ways to select a sample—some good and some bad.
Bad ways to sample
Convenience sample: The researcher chooses a sample that is readily available in some non-random way.
Example—A researcher polls people as they walk by on the street.
Why it's probably biased: The location and time of day and other factors may produce a biased sample of people.
Voluntary response sample:
The researcher puts out a request for members of a population to join the sample, and people decide whether or not to be in the sample.
Example—A TV show host asks his viewers to visit his website and respond to an online poll.
Why it's probably biased: People who take the time to respond tend to have similarly strong opinions compared to the rest of the population.