Question 1

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package. The 500 employees who will participate in this study constitute the ________.

Accepted Answer

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Question 2

The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the proportion of students at her university who visited campus bars on the weekend before the final exam week. Her assistant took a random sample of 250 students. The portion of students in the sample who visited campus bars on the weekend before the final exam week is an example of ________.
A) a population.
B) a sample.
C) a parameter.
D) a statistic.

Accepted Answer

The portion of students in the sample who visited campus bars on the weekend before the final exam week is an example of a statistic, which is a descriptive measure of a sample. A population refers to the entire group of individuals or objects that we are interested in studying, while a sample is a smaller subgroup of the population that is actually studied. A parameter is a descriptive measure of a population.

Question 3

A population is the totality of items or things under consideration.

Accepted Answer

This is the definition of population.

Question 4

Mediterranean fruit flies were discovered in California a few years ago and badly damaged the oranges grown in that state. Suppose the manager of a large farm wanted to study the impact of the fruit flies on the orange crops on a daily basis over a 6-week period. On each day a random sample of orange trees were selected from within a random sample of acres. The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated. In this study, drawing conclusions on any one day about the true population characteristics based on information obtained from the sample is called ________.

Accepted Answer

The answer of Mediterranean fruit flies were discovered in California...

Question 5

A professor computed the sample average exam score of 20 students and used it to estimate the average exam score of the 1,500 students taking the exam was an example of inferential statistics.

Accepted Answer

This statement describes using a sample of data to make an inference about the population, which is the basis of inferential statistics.

Question 6

Using the number of registered voters who turned out to vote for the primary in Iowa to predict the number of registered voters who will turn out to vote in Vermont's primary is an example of descriptive statistics.

Accepted Answer

This is an example of inferential statistics, as it involves making a prediction about a different population (Vermont) based on information from a sample (Iowa). Descriptive statistics simply involves summarizing and describing data from a specific population or sample.

Question 7

Mediterranean fruit flies were discovered in California a few years ago and badly damaged the oranges grown in that state. Suppose the manager of a large farm wanted to study the impact of the fruit flies on the orange crops on a daily basis over a 6-week period. On each day a random sample of orange trees were selected from within a random sample of acres. The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated. The two main measures calculated each day (i.e., average number of damaged oranges per tree and proportion of trees having damaged oranges) may be used on a daily basis to estimate the respective true population ________.

Accepted Answer

The answer of Mediterranean fruit flies were discovered in California...

Question 8

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package. Information obtained from the sample will be used to draw conclusions about the true population ________.

Accepted Answer

The answer of The Human Resources Director of a large...

Question 9

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package. In this study, methods that result in decisions concerning population characteristics based only on the sample results are called ________.

Accepted Answer

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Question 10

Problems may arise when statistically unsophisticated users who do not understand the assumptions behind the statistical procedures or their limitations are misled by results obtained from computer software.

Accepted Answer

This statement is true. Users who do not have a clear understanding of the assumptions and limitations of statistical procedures can easily misinterpret results obtained from computer software, leading to erroneous conclusions.

Question 11

A statistic is usually used to provide an estimate for a usually unobserved parameter.

Accepted Answer

A statistic is a numerical value calculated from a sample of data and is used to estimate an unknown parameter of a population. Therefore, it is usually used to provide an estimate for a usually unobserved parameter.

Question 12

A sample is the portion of the universe that is selected for analysis.

Accepted Answer

A sample is a representative portion of the population or universe that is selected for analysis.

Question 13

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package. All the employees in the corporation constitute the ________.

Accepted Answer

The answer of The Human Resources Director of a large...

Question 14

Mediterranean fruit flies were discovered in California a few years ago and badly damaged the oranges grown in that state. Suppose the manager of a large farm wanted to study the impact of the fruit flies on the orange crops on a daily basis over a 6-week period. On each day a random sample of orange trees were selected from within a random sample of acres. The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated. The two main measures calculated each day (i.e., average number of damaged oranges per tree and proportion of trees having damaged oranges) are called ________.

Accepted Answer

The answer of Mediterranean fruit flies were discovered in California...

Question 15

Managers need an understanding of statistics to be able to present and describe information accurately, draw conclusions about large populations based on small samples, improve processes, and make reliable forecasts.

Accepted Answer

Understanding statistics is essential for managers to make informed decisions, improve processes, and predict future outcomes. It helps them to accurately analyze and interpret data, identify patterns, and draw valid conclusions that impact organizational performance. Without a solid understanding of statistics, managers may make poor decisions and inaccurate forecasts, leading to negative consequences for the organization.

Question 16

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package. The Director will use the data from the sample to compute ________.

Accepted Answer

The answer of The Human Resources Director of a large...

Question 17

A statistic is usually unobservable while a parameter is usually observable.

Accepted Answer

The opposite is true - a parameter is usually unobservable while a statistic is usually observable. A parameter is a numerical measurement that describes the entire population, while a statistic is a numerical measurement that describes a sample of the population.

Question 18

TABLE 1-1
The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a DVD player made by the company over the past 12 months are satisfied with their products.
-Referring to Table 1-1, the population of interest is
A) all the customers who have bought a DVD player made by the company over the past 12 months.
B) all the customers who have bought a DVD player made by the company and brought it in for repair over the past 12 months.
C) all the customers who have used a DVD player over the past 12 months.
D) all the customers who have ever bought a DVD player made by the company.

Accepted Answer

The question specifically mentions customers who have purchased a DVD player made by the company over the past 12 months as the population of interest. Therefore, choice A is the correct answer. Choice B is not correct because it refers only to customers who have brought their DVD player in for repair, whereas the question is interested in all customers who have purchased a DVD player. Choice C is too broad, as it includes customers who may have used a DVD player made by a different company. Choice D includes all customers who have ever bought a DVD player from the company, not just those who have purchased one over the past 12 months.

Question 19

Compiling the number of registered voters who turned out to vote for the primary in Iowa is an example of descriptive statistics.

Accepted Answer

Descriptive statistics summarize and organize characteristics of a data set, such as compiling the number of registered voters who turned out to vote, which is an example of describing a dataset without inferring beyond the data.

Question 20

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential package. In this study, methods involving the collection, presentation, and characterization of the data are called ________.

Accepted Answer

The answer of The Human Resources Director of a large...

Quiz 1: Instruction and Data Collection

A population is the totality of items or things under consideration.

A professor computed the sample average exam score of 20 students and used it to estimate the average exam score of the 1,500 students taking the exam was an example of inferential statistics.

Using the number of registered voters who turned out to vote for the primary in Iowa to predict the number of registered voters who will turn out to vote in Vermont's primary is an example of descriptive statistics.

Problems may arise when statistically unsophisticated users who do not understand the assumptions behind the statistical procedures or their limitations are misled by results obtained from computer software.

A statistic is usually used to provide an estimate for a usually unobserved parameter.

A sample is the portion of the universe that is selected for analysis.

Managers need an understanding of statistics to be able to present and describe information accurately, draw conclusions about large populations based on small samples, improve processes, and make reliable forecasts.

A statistic is usually unobservable while a parameter is usually observable.

Compiling the number of registered voters who turned out to vote for the primary in Iowa is an example of descriptive statistics.