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Fandango claim's that the average cost of a movie ticket is at least $8.75 for an adult, with a known variance of $0.25. To test this claim, a random sample of 75 tickets had a mean of $8.06. There is no reason to think the variance is any different in the sample. Based upon this information, can we reject Fandango's claim at the 5% level of significance.
IQ scores in the population have a mean of 100 and a standard deviation of 15. If Bob has an IQ of 83, what percent of people have scores lower than him? If Sally has an IQ of 97, what percent of people have scores higher than her?
A company counted the number of their employees in each of the following age classes. According to this distribution, what is the average age of the employees in the company?
Given the random variables X and Y in Problem 4.2.1, find (a) The marginal PMFs PX (x) and PY (y),
a sample of size 80 is to be used to test the hypotheses h0 mu29 vs. ha mugt29where mu is the true average age of a man
Assume it is possible to adjust the scales in a linear manner to read Y = aX+b. How should a and b be chosen in order that Y has the same mean but fewer than 2% of the readings of Y exceed 4.2 gm.
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
What is the probability that between 42 and 47 (inclusive) consider the availability of company-sponsored training as a factor to weigh in taking a job?
Quality control. Sammy's Salsa, a small local company, produces 20 cases of salsa a day. Each case contains 12 jars and is imprinted with a code.
Find the probability that both adults dine out more than once per week. The probability that both adults dine out more than once per week is nothing.
Consider a hypothesis test for a proportion and for a mean. a. What assumptions must be met for a hypothesis test for a proportion?
A leading consumer magazine advised its readers to purchase pressure washers with a power rating of 15 hp or more. What proportion of pressure washers have this
When testing the hypothesis (at the 5% level of significance) that the average amount spent on trips taken by the sales department are higher than thosetaken by the HR department what is the test statistic? (please round your answer to 2decimal pl..
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