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A company's manufacturing process uses 500 gallons of water at a time. A "scrubbing" machine then removes most of a chemical pollutant before pumping the water into a nearby lake. To meet federal gregulations the treated water must not contain more than 80 parts per million (ppm) of the chemical. The machine's output can be described by a normal model with standard deviation 4.2 ppm. The company's lawyers insist that no more than 2% of the treated water be over the limit. To achieve this, to what mean should the company se the scrubbing machine
a. 80 ppm
b. 69.459 ppm
c. 88.626 ppm
d. 75 ppm
e. 71.374 ppm
Thirty minutes later, a police officer measured their Blood Alcohol Content (BAC) in grams of alcohol per deciliter of blood. Estimate the mean BAC that happens thirty minutes after consumption of 7 cans of beer.
Design and First Question on Response Rates for a Mail Survey of Skydivers" (Leisure Science, 1991) tested this theory by experimenting with different cover designs.
Determine the probability that adult owns stock and has some college education? Determine the probability that adult owns stock or has some college education?
"Suppose that we conducted a survey in which we asked 800 people the following question: "In the event of an emergency, would you seek medical assistance at the emergency room of our hospital?"
How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion of women over 55 who are widows?
Regression - What factors predict duration of dyspnea in elders with heart failure?
If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than Arc?
What is the standard deviation of the number of requests in a 10 hour work day? Give your answer to four decimal places.
At 5 % level of significance, does this sample prove violation of the guideline that average patient muts pay no more than $250 out-of-pocket? Is this a close decision?
Complete the ANOVA table. Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
For a sample of students in the college of business administration at mid-atlantic university, the mean grade point average is 3.10 with a standard deviation of 0.25.
A business finds the average cost required to complete a project is $416 with a standard deviation of $57. A sample of 36 project cost reports was selected at random.
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