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Chapter 2: Problem 13

As part of a curriculum review, the psychology department would like to select a simple random sample of 20 of last year's 140 graduates to obtain information on how graduates perceived the value of the curriculum. Describe two different methods that might be used to select the sample.

Short Answer

Expert verified
The two different methods that can be used to select the sample are: 1. Using Numbered Tickets, where each graduate is numbered and then tickets are drawn randomly. 2. Using a computer to generate random numbers corresponding to the graduates.

Step by step solution

01

Method 1: Using Numbered Tickets

This classical method involves numbering each graduate from 1 to 140. Place these numbered tickets in a bowl and mix them thoroughly. Without looking, draw 20 tickets from the bowl. The numbers on these tickets correspond to the individuals who will make up the sample.
02

Method 2: Using Computer Generated Random Numbers

Technology can also be used to select a simple random sample. List all the graduates from 1 to 140 in a table. Using a random number generator (such as the one that can be found in most statistical programs), generate 20 distinct numbers between 1 and 140. The graduates that correspond to these numbers will make up the sample. Note: Make sure the random number generator gives distinct numbers, or there's a mechanism to exclude previously selected numbers to ensure no graduate is sampled twice.

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