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A factory has 1200 workers. A simple random sample of 100 of these had weekly salaries with a (sample) mean of £315 and a (sample) standard deviation of £20. Calculate a 90% confidence interval for the mean weekly salary of all workers in the factory.
to compare two kinds of front-end design six of each kind were installed on a certain make of compact car. then each
for a population with a mean of micro 70 a score of x 62 corresponds to z -2.00. what is the population standard
Vocabulary scores of seventh-grade students. Figure 3.14 displays the scores of all 947 seventh-grade students in the public schools of Gary
Ace! Measure the normal Rafael Nadal hits the ball extremely hard. His first-serve speeds follow a Normal distribution with mean 115 miles per hour (mph).
the breaking strength of a rivet has a mean value of 10050 psi and a standard deviation of 505 psi.a what is the
You are interested in investing, and are considering a portfolio comprised of the following two stocks. Their estimated returns under varying market conditions are provided:
as the population ages there is increasing concern about the accident-related injuries to the elderly. the article age
How did George Kennan suggest the US should respond to the growth of communism?
the indiana department of transportation wishes to survey state residents to determine what proportion of the
Set up the null and alternative hypotheses for the toothpaste manufacturer. Out of a random sample of 40 toothpaste purchases, 19 are from this manufacturer. Can you conclude the toothpaste manufacturer's claim at α = 0.024? (Use p-value approac..
a.) The relationship between gender and pet ownership is significant. b.) The relationship between gender and pet ownership is not significant.
Estimate the mean height of females in the health profession. Use the given population standard deviation of 2.75 inches.
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