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A study found that the average American buys 4.6 movie tickets per year, compared to just 1.9 for the average Spaniard. Assuming that the data values in file XR04049 represent the number of movie ticket purchases reported by 100 American respondents,
a. Select a simple random sample of 20 data values. Compute the sample mean.
b. Select another simple random sample of 20 data values, and compute the mean.
c. To two decimal places, compare the mean of the sample in part (a) with the mean of the sample in part (b). Are the values identical?
Would you expect them to be? How do they compare to the mean of the 100 data values from which the samples were drawn? (We will learn more about this topic in Chapter 8, Sampling Distributions.)
Can you think of an example where the analysis of variance (ANOVA) can be used? How is ANOVA being used in the workplace, or how should it be used?
in 1999 a sample of 200 in-store shoppers showed that 42 paid by debit card. in 2004 a sample of the same size showed
Then explain your answer to someone who has never had a course in statistics (but who is familiar with mean, standard deviation, and Z scores).
An insurance company needs to assess the risks associated with providing hurricane insurance. Between 1990 and 2006, Florida was hit by 22 tropical storms or hurricanes. If tropical storms and hurricanes are independent and the mean has not change..
Customers arrive according to a Poisson process with rate A outside a bank where there are two automated teller machines (ATM). The two ATMs are not identical. We estimate that 30% of the customers use only ATM no.
Objective(s) of this Assignment:The assignment is being uploaded to build up the students concepts regarding;1. Measure of central tendency2. Measure of Dispersion
Determine the range and standard deviation of the times.
The procedure square-list takes a list of numbers as argument and returns a list of the squares of those numbers. (square-list (list 1 2 3 4)) (1 4 9 16) Here are two different definitions of square-list. Complete both of them by filling in the mi..
a random sample of 121 checking accounts at a bank showed an average daily balance of 280. the standard deviation of
Motivation. Explain the purpose of the segmentation approach that models these businesses with a history of bankruptcy from the other businesses.
Suppose the coin is in fact loaded so that its probability of landing heads is .60. What is the power of this test? (Hint: calculate the probability of rejecting H0 when p = .60.) What is your probability of making a Type II error
A biologist with the Department of Agriculture is studying the growth of artichokes. She knows that the number of artichokes produced by each plant follows a distribution which is approximately normal.
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