A researcher wants to study the effects of sleep deprivation on motor skills. Ni

Question

A researcher wants to study the effects of sleep deprivation on motor skills. Nine people volunteer for the experiment: Amanda, Brian, Christine, David, Emily, Fred, George, Heather, and Ivan. Use the second row of digits in the random number table below to select a simple random sample of three subjects (ignore zeros). The other six subjects will go into the control group. If the subjects are numbered 1 through 9 alphabetically, what are the numbers of the three subjects selected? List the subjects that will go in the treatment group. What are the numbers of the three subjects selected? The three subjects, in the order selected, are

Explanation / Answer

Solution

Procedure for selecting the sample of 3.

Start from a random point on the random number table [in this case, we are told to start from the second row], pick single digit numbers sequentially. Connect the picked number to the serial number of the nine volunteers and select that volunteer as a sample. Ignoring zeroes, continue the process till 3 volunteers are selected. Record the results of this process in a table as shown below:

Trial #

1

2

3

Random #

4

6

2

Serial # of selected sample

4

6

2

Name of the volunteer

David

Fred

Brian

DONE

Trial #

1

2

3

Random #

4

6

2

Serial # of selected sample

4

6

2

Name of the volunteer

David

Fred

Brian

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