# Question

A study found that the average American buys 4.6 movie tickets per year, compared to an average of 3.2 in Ireland. 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.)

A computer and statistical software capable of selecting random or systematic samples.

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.)

A computer and statistical software capable of selecting random or systematic samples.

## Answer to relevant Questions

The Sonic Travel Agency has not kept pace with the current boom in family vacation air travel between the agency’s northern city and sunny Florida. For each of the following, indicate whether the associated data are ...A mail survey of junior executives is designed to measure how much time they spend reading The Wall Street Journal each day and how they feel about the newspaper’s content and layout. Formulate one question of each of the ...In general, what are some of the considerations in evaluating the suitability of data that have been generated by someone else? For what types of sources should secondary data be regarded with special skepticism? Unknown to a quality assurance technician, the tensile strengths (in pounds per square inch, psi) for all 500 heavy-duty construction bolts in a recent shipment are as listed in file XR04074. Because a bolt must be broken to ...Using the table in Exercise 5.15, assume that one well has been selected at random from the 48,673. a. What is the probability that the well was drilled in North America and was dry? b. What is the probability that the well ...Post your question

0