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According to national Health and Nutrition Examination Survey, published by National Center for Health Statistics, serum total cholesterol levels of U.S. females 20 years old or older is normally distributed with mean of 206 mg/dL and standard deviation of 44.7 mg/dL. Let x signify serum total cholesterol level for U.S. females 20 years old or older. Draw the distribution of the variable x.
Martin Motors has in stock three cars of the same make and model. The president would like to evaluate the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline. For each trial, a gallon of gaso..
The mean salary of the nine employees of a small business is $52,000 per year. One employee, whose salary was $68,000, was red. Two new employees, who will each be paid a salary of $40,000, are hired. What is the new mean annual salary of the emp..
Let random variable X represent number of heads on first toss and y total number of heads from three tosses. Sketch tree view with X as first level and Y/X as second level and determine conditional probability p(Y=2/X=1).
The quality control process at a manufacturing plant requires that each lot of finished units be sampled for defective items. Twenty units from each lot are inspected.
Findout the 98% confidence interval for true mean. Findout a 98% confidence interval for the cigarette tax in all 50 states.
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
Create the table for frequency distribution that has 16 class intervals of width 1 inch. Utilize 61.5 inches as lower limit of first interval and 62.5 as upper limit.
A simple random sample of 100 of a certain popular model car in 2003 found that 20 had a certain minor defect in the brakes. A simple random sample of 400 of this model car in 2004 found that 50 had the minor defect in the brakes.
A class has 13 women and 18 men. If student if selected randomly, determine the probability student is a woman?
Scenario: Dole Pineapple, Inc., is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03 ounces.
As part of his review for a chemistry test, a student randomly selects (without replacement) 40 out of 102 elements listed on the standard tables, and tries to guess their atomic numbers.
A group of investors wants to develop a chain of fast food cafés. In determining potential costs for each facility, they must consider, among other costs, the average monthly cost of electricity.
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