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Suppose that cars arrive at Burger King's drive through at the rate of 20 cars every hour between 12:00 noon and 1:00 pm. A random sample of 40 one-hour time periods between 12:00 noon and 1:00 pm is selected and has 22.1 as the mean number of cars arriving.
a) Why is the sampling distribution of x-bar approximately normal?
b) What is the mean and standard deviation of the sampling distribution of x-bar assuming that mean =20 and standard deviation equals the square root of 20?
c) What is the probability that a simple random sample of 40 one-hour time periods results in a mean of at least 22.1 cars? Is this result unusual? What might we conclude?
Fifty raffle tickets are numbered 1 throughout 50, and one of them is drawn at random. What is the probability that the number is a multiple of 5 or 8? Consider the following "solution": Since 10 tickets bear numbers that are multiples of 5 and 6 ..
Assume that Los Arboles had a special program in place to encourage helmet use. Elucidate to what extent did removal of the outlier improve the fit.
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
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The analysis of variances produces df between = 3 and df within = 24. For this analysis, determine df total ?
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Find the critical value for different types of sample size and level of significance:
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The Bureau of Labor Statistics says that baggage handlers, trash haulers, and coal miners are among the occupations having the highest risk of the debilitating injury or illness. For coal miners working over the course of a year, 3.60 injuries per..
Use a decision tree to describe the possible strategies and the consequences (or payoffs) of each. Show your decision tree.
Use this information to determine the empirical probability that the next bird to visit the feeding station will be a dove.
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