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Based on FAA estimates the average age of the fleets of the 10 largest U.S. commercial passenger carriers is 13.4 years with a standard deviation of 1.7 years. Suppose that 40 airplanes were randomly selected from the fleets of these 10 carriers and were inspected for cracks in these airplanes that are considered too large for flying. What is the probability that the average age of these 40 airplanes is at least 14 years old? Round your answer to 4 decimal places. Remember to round your z-value to two decimal places.
Use a 0.01 significance level to test the claim that most people believe that the Loch Ness monster exists. How is the conclusion affected by the fact that Internet users who saw the question could decide whether to respond.
A software company wants to determine whether there is a relationship between their three sales offices and the sales of their software products. The actual sales results are
5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
how would you go about selecting a particular level of significance icircplusmn to conduct a hypothesis test? provide
What is the probability that a single randomly sampled battery of this type lasts longer than 100 minutes. Does this suggest that a charge-life exceeding 100 minutes would be unusual?
A population that starts at 100 and doubles in growth every eight years: The expression would give the population t years after the growth starts.
What is the probability that a randomly chosen employee is an Administrator if the employee has the opportunity of gaining promotion next year?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Marge and Joe have five daughters. They decide to have another baby because they are sure the next one will be a boy (after all, what are the odds of having another girl!)
question use the values in the joint probability table to solve the equations
Listed below are the highway fuel consumption amounts (in mi/gal) from cars in three different categories. Use a 0.05 signifiacance level to test the claim that the different car categories have the same median highway fuel consumption.
let y1 and y2 be uncorrelated random variables. consider u1 y1 y2 and u2 y1-y2.a. find the covariance between u1 and
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