Over the Entire Six Years That Students Attend an Ohio

question 51

Multiple Choice

Over the entire six years that students attend an Ohio elementary school,they are absent,on average,28 days due to influenza.Assume that the standard deviation over this time period is days.Upon graduation from elementary school,a random sample of 36 students is taken and asked how many days of school they missed due to influenza. Refer to Exhibit 7-1.The probability that the sample mean is less than 30 school days is _______.

• A)0.0918
• B)0.4129
• C)0.5871
• D)0.9082

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Definitions:

Dependent Variable

The variable in an experiment that is expected to change in response to manipulations of the independent variable.

Control Group

In experimental research, a group of subjects who do not receive the experimental treatment and are used as a benchmark to measure the effect of the treatment.

Experimental Group

The group in a scientific study that receives the intervention or treatment under investigation.

Independent Variable

In an experimental setting, the variable that is manipulated or changed to observe its effect on the dependent variable.