Determine whether the sample described below is a simple random sample.
In order to test for a difference in the way that men and women purchase magazines, a research institution polls exactly 762 adult men and 762 adult women randomly selected from adults in the United States.
The sample is not a simple random sample because every sample of size 1524 does not have the same chance of being selected.
What is the difference between a random sample and a simple random sample?
With a random sample, each individual has the same chance of being selected. With a simple random sample, all samples of the same size have the same chance of being selected.
Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster.
To determine customer opinion of their service, Business Depot randomly selects 70 stores during a certain week and surveys all customers present in the store.
Cluster
Determine whether the description below corresponds to an observational study or an experiment.
In a survey sponsored by a company, 13,072 people were asked what contributes most to their anxiety, and 39% of the respondents said that it was their job.
The study is an observational study because the survey subjects were not given any treatment.
Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster.
A magazine asks its readers to call in their opinion regarding the amount of advertising in the present issue.
Convenience
A handler loads one item every 15 minutes, so 160 items are completed in her first week of work. Her manager checks her work by randomly selecting a day of the week, then reviewing all the items she completed that day.
Does this sampling plan result in a random sample?
Does this sampling plan result in a simple random sample?
Yes, because each item has an equal chance of being selected.
No, because all possible groups of n items do not have an equal chance of being selected.