Find the Standard Deviation of the Binomial Random Variable

question 11

Multiple Choice

Find the standard deviation of the binomial random variable.
-On a multiple choice test with 10 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the random
Variable X, the number of correct answers.

• A)1.299
• B)1.342
• C)1.369
• D)1.273

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Definitions:

Income

The amount of money brought into a household from various sources during a given year (wages, investment income, dividends, etc.).

Independent Variable

A variable in an experiment or study that is manipulated to determine its effect on the dependent variable.

Dependent Variable

In research, it’s the outcome or factor that researchers are interested in understanding or predicting, which changes in response to the independent variable.

Hawthorne Effect

The alteration of behavior by the subjects of a study due to their awareness of being observed.