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8. Sampling Distributions & Confidence Intervals: Proportion

Confidence Intervals for Population Variance

8. Sampling Distributions & Confidence Intervals: Proportion

Confidence Intervals for Population Variance

Multiple Choice
In the context of confidence intervals for a population variance $σ^{2}$ , can a (population or sample) variance ever be negative?
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Multiple Choice
What is wrong with expressing the confidence interval $3.8 < σ^{2} < 6.4$ as $σ^{2} = 5.1 \pm 1.3$ ?
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Multiple Choice
A delivery service tracks the weights of its packages. A sample of 20 packages has a variance of 4.5 lbs². Construct a 95% conf. int. for the population variance. Assume a normal distribution.
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