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General Statistics: Ch 1, Sec 1.4 HW

front 1

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.

back 1

The sample is not a simple random sample because every sample of size 1524 does not have the same chance of being selected.

front 2

What is the difference between a random sample and a simple random​ sample?

back 2

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.

front 3

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.

back 3

Cluster

front 4

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.

back 4

The study is an observational study because the survey subjects were not given any treatment.

front 5

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.

back 5

Convenience

front 6

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?

back 6

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.