Practice Standard Deviation & Variance (1) - Standard Deviation & Variance

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9 questions

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3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the mean of the following data set: 4, 8, 6, 5, 3?
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Add the numbers and divide by the total count.
Question 2.
Is a standard deviation of zero informative? Why?
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Think about what zero spread means.
3Question 3.
What does the Standard Deviation signify?
- Mean of data
- Spread of data
- Frequency of data
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Think about what the spread tells you.
4Question 4.
True or False: A variance of zero indicates high variability.
- True
- False
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What does variability mean?
Question 5.
Using the following dataset, 15, 22, 30, 42, calculate both variance and standard deviation and interpret these results.
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Carefully compute each step and ensure you square the differences.
Question 6.
Given a frequency distribution of ages: 5-10 (2), 10-20 (4), 20-30 (6), compute the variance of the ages.
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Start by finding midpoints and next average them before deviation calculations.

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