Concept explainers
In Exercises 7–10, use the same population of {4, 5, 9} that was used in Examples 2 and 5. As in Examples 2 and 5, assume that
7. Sampling Distribution of the Sample Variance
a. Find the value of the population variance σ2.
b. Table 6-2 describes the sampling distribution of the sample mean. Construct a similar table representing the sampling distribution of the sample variance s2. Then combine values of s2 that are the same, as in Table 6-3 (Hint: See Example 2 on page 258 for Tables 6-2 and 6-3, which describe the sampling distribution of the sample mean.)
c. Find the mean of the sampling distribution of the sample variance.
d. Based on the preceding results, is the sample variance an unbiased estimator of the population variance? Why or why not?
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Chapter 6 Solutions
EFSC STA 2023 MML ACCESS
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