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A magazine includes a report on the energy costs per year for 32-inch liquid crystal display (LCD) televisions. The article states that 14 randomly selected 32-inch LCD televisions have a sample standard deviation of $3.90. Use a 99% level of confidence.
Assume the sample is from a normally distributed population and construct the indicated confidence intervals for
(a) The population variance σ2
(b) The population standard deviation σ. Interpret the results. |
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