A random sample of 15 snowmobiles was selected, and the lifetime (in months) of the batteries was measured. The variance of the sample was 8.6. Find the 90% confidence interval of the true variance.
Answer to relevant QuestionsUse the data from Exercise 5 to estimate the population variance (standard deviation) in length of children’s animated films with 99% confidence. For a certain urban area, in a sample of 5 months, on average 28 mail carriers were bitten by dogs each month. The standard deviation of the sample was 3. Find the 90% confidence interval of the true mean number of mail ...For each conjecture, state the null and alternative hypotheses. a. The average age of community college students is 24.6 years. b. The average income of accountants is $51,497. c. The average age of attorneys is greater than ...The mean age of Senators in the 109th Congress was 60.35 years. A random sample of 40 senators from various state senates had an average age of 55.4 years, and the population standard deviation is 6.5 years. At α = 0.05, is ...Ten years ago, the average acreage of farms in a certain geographic region was 65 acres. The standard deviation of the population was 7 acres. A recent study consisting of 22 farms showed that the average was 63.2 acres per ...
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