Check Your Understanding 3.7

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Chapter 3: Descriptive Statistics

Check Your Understanding

This activity contains 2 questions.

Calculate the variance for Data Set J and compare it with that of Data Set I.

Step 1:	Step 2:
Difference	Multiply by Itself	Squared
98 – 77.05 =
96 – 77.05 =
87 – 77.05 =
78 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
75 – 77.05 =
72 – 77.05 =
72 – 77.05 =
72 – 77.05 =
72 – 77.05 =
72 – 77.05 =
72 – 77.05 =

Step 3: Sum of the squares

Step 4: Divide the Sum of Squares by the Number of Scores Which set of data, J or I, has the larger variance?

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

Apply Your Knowledge

Data Sets I and J have means that are very similar. Why do you think there is such a large difference between the variance of I and the variance of J?

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Check Your Understanding 3.7

Apply Your KnowledgeData Sets I and J have means that are very similar. Why do you think there is such a large difference between the variance of I and the variance of J?

Apply Your Knowledge

Data Sets I and J have means that are very similar. Why do you think there is such a large difference between the variance of I and the variance of J?