##### General Statistics: Ch 1, Sec 1.4 HW

College: First year, College: Second year, College: Third year, College: Fourth year

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.