Confidence interval for the standard deviation
What is the 99% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 28 babies born there was 1.3 punds?
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What is the 99% confidence interval for the variance of exam scores for 25 algebra students, if the standard deviation of their last exam was 10.7?
In a sample of 60 mice, a biologist found that 42% were able to run a maze in 30 seconds or less. Find the 98% limit for the population proportion of mice who can run that maze in 30 seconds or less.
What is the kinetic energy of the vehicle in Btu? If gasoline costs $4.10/gallon, how much money is saved by not stopping at the stop sign? Use your answer from part (c).
A company produces a women's bowling ball that is supposed to weigh exactly 14 pounds. Unfortunately, the company has a problem with the variability of the weight. In a sample of 10 of the bowling balls the sample standard deviation was found to b
Find the area of the normal curve for the following:
Calculate the mass in grams of iodine (I2) that wil react completely with 34.1 g of aluminum (Al) to form aluminum iodide (AlI3).
A web based software company is interested in estimating the proportion of individuals who use the Firefox browser. In a sample of 200 of individuals, 19 users stated that they used Firefox. Using this data, construct a 99% confidence interval for
A 60 kg rectangular box, open at the top, has a base dimensions 1.0 m by 0.80 m and depth 0.50 m. a) How deep will it sink in fresh water? Assume the density of water is 1000 kg/m3.
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