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Home  arrow Chapter-specific resources  arrow Chapter 5: Standard deviation and z-scores: The standard unit of measurement in statistics  arrow Multiple choice questions

Multiple choice questions

Try the multiple choice questions below to test your knowledge of this chapter. Once you have completed the test, click on 'Submit Answers for Grading' to get your results.

This activity contains 13 questions.

Question 1.
Which of the following is the best definition of standard deviation?

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Question 2.
Which of the following is true?

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Question 3.
Which of the following is true?

End of Question 3

Question 4.
A researcher obtains a standard deviation of -6.23 for the variable 'achievement motivation'.

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Question 5.
A z-score of -3.0 means:

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Question 6.
The mean of a set of scores is 5.0, the variance is 4.00, the standard deviation is 2.0, and the mode is 3.5. What is a score of 8.00 expressed as a z-score?

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Question 7.

A researcher decides to measure mathematical ability by adding together the z-scores on 'addition' and 'multiplication'. The mean score on 'addition' is 20.00 and the standard deviation is 3.00; the mean score on multiplication is 5.00 and the standard deviation is 1.00. What would be the score on mathematical ability for a child who scored 26.00 on 'addition' and 8.00 on 'multiplication'?
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Question 8.
If for three individuals the obtained z-scores were 3.00; -2.00; and 1.64, what would be the proportion of individuals who scored higher than them according to the table of the standard normal z-distribution?

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Question 9.
Approximately how many people would have scores LOWER than an individual with a z-score of 1.96?

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Question 10.
A standard score is:

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Question 11.
The z-score of Jack's age is -2.00 and the z-score of Jill's age is 1.00. Approximately what percentage of people are older than Jack but younger than Jill?

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Question 12.
z-scores should only be used with:

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Question 13.
The following data are needed to answer this question:

The IQ scores of five children are 100, 102, 98, 97 and 103.

The z-score of an IQ of 100 is:

End of Question 13

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