A random sample of 22 lawn mowers was selected, and the motors were tested to see how many miles per gallon of gasoline each one obtained. The variance of the measurements was 2.6. Find the 95% confidence interval of the true variance
Answer to relevant QuestionsA 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. The lengths (in minutes) of a random selection of popular children’s animated films are listed below. Estimate the true mean length of all children’s animated films with 95% confidence. 93 83 76 92 77 81 78 100 ...Using the z table (Table E), find the critical value (or values) for each. a. α = 0.05, two-tailed test b. α = 0.01, left-tailed test c. α = 0.005, right-tailed test d. α = 0.01, right-tailed test e. α = 0.05, ...The average expenditure per student (based on average daily attendance) for a certain school year was $10,337 with a population standard deviation of $1560. A survey for the next school year of 150 randomly selected students ...The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon indicated a mean size of 430 acres, and the population standard deviation is 52 acres. At α = 0.05, can it be concluded that the ...
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