From the types of samples discussed in class and in the text (two kinds of non-p
ID: 3153667 • Letter: F
Question
From the types of samples discussed in class and in the text (two kinds of non-probability samples and four kinds of probability samples), identify what type the following represent:
To obtain a sample of 10 books in the store, the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf.
The Dean of Students mailed a survey to a total of 400 students. The sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus last term.
A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory.
The evening host of a dinner dance reached into a bowl, mixed all the tickets around, and selected the ticket to award the grand door prize.
Explanation / Answer
To obtain a sample of 10 books in the store, the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf.
This is an example of convinience sampling.
The Dean of Students mailed a survey to a total of 400 students. The sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus last term.
Here we use stratified sampling.
A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory.
Here we use systematic sampling.
The evening host of a dinner dance reached into a bowl, mixed all the tickets around, and selected the ticket to award the grand door prize.
Here we use simple random sampling.
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