Question 1

When a statistician omits data contrary to her findings in a study,she is justified as long as the sample supports her objective.

Accepted Answer

A) True 
 B)False

Question 2

Descriptive statistics refers to summarizing data rather than generalizing about the population.

Accepted Answer

A) True 
 B)False

Question 3

Which is not a likely area of application of statistics in business?

Accepted Answer

A)   Auditing supplier invoices for correct payment
B)   Questioning the executives' strategic decisions
C)   Looking for patterns in a large marketing database
D)   Making forecasts of several key product lines

Question 4

Valid statistical inferences cannot be made when sample sizes are small.

Accepted Answer

A) True 
 B)False

Question 5

Estimating parameters and testing hypotheses are important aspects of descriptive statistics.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements is not true?

Accepted Answer

A)   Statistics helps refine theories through ongoing hypothesis testing.
B)   Statistics is the science of collecting,organizing,analyzing,interpreting,and presenting data.
C)   Estimating parameters is an important aspect of descriptive statistics.
D)   Statistical challenges include imperfect data and practical constraints.

Question 7

How might statistics be useful in determining the correct width of doorways in a convalescent care facility so that 99 percent of the "typical" wheelchairs can pass through the doorway without coming closer than 6 inches on either side?

Accepted Answer

Large samples could be taken of wheelcha...

Question 8

Which of the following statements is not true?

Accepted Answer

A)   A statistic is a single measure (usually numerical) that is calculated from a sample.
B)   Statistics is the science of collecting,organizing,analyzing,interpreting,and presenting data.
C)   For day-to-day data business analysis,most firms rely on a large staff of expert statisticians.
D)   A statistical test may be significant yet have no practical importance. C

Question 9

Statistics can help you handle either too little or too much information.

Accepted Answer

A) True 
 B)False

Question 10

Pitfalls to consider in a statistical test include nonrandom samples,small sample size,and lack of causal links.

Accepted Answer

A) True 
 B)False

Question 11

Statistics helps surmount language barriers to solve problems in multinational businesses.

Accepted Answer

A) True 
 B)False

Question 12

Which is not an essential characteristic of a good business data analyst?

Accepted Answer

A)   Effective writer
B)   Stays current on techniques
C)   Has a Ph.D.or master's degree in statistics
D)   Can deal with imperfect information

Question 13

Because 25 percent of the students in my morning statistics class watch eight or more hours of television a week,I conclude that 25 percent of all students at the university watch eight or more hours of television a week.The most important logical weakness of this conclusion would be:

Accepted Answer

A)   relying on any sample instead of surveying every student.
B)   using a sample that may not be representative of all students.
C)   failing to correct for unconscious interviewer bias.
D)   assuming cause and effect where none exists.

Question 14

Which best illustrates the distinction between statistical significance and practical importance?

Accepted Answer

A)   "In 2006,240 out of 400 statistics students at Oxnard Technical College sold their textbooks at the end of the semester,compared with 220 out of 330 students in 2005,a significant decrease."
B)   "Our new manufacturing technique has increased the life of the 80 GB USB AsimoDrive external hard disk significantly,from 240,000 hours to 250,000 hours."
C)   "In 50,000 births,the new vaccine reduced the incidence of infant mortality in Morrovia significantly from 14.2 deaths per 1000 births to 10.3 deaths per 1000 births."
D)   "The new Sky Penetrator IV business jet's cruising range has increased significantly from 3,975 miles to 4,000 miles."

Question 15

Excel has limited use in business because advanced statistical software is widely available.

Accepted Answer

A) True 
 B)False

Question 16

A business data analyst needs a PhD in statistics.

Accepted Answer

A) True 
 B)False  False

Question 17

"Tom's SUV rolled over.SUVs are dangerous." This best illustrates which fallacy?

Accepted Answer

A)   Unconscious bias
B)   Significance versus practical importance
C)   Post hoc reasoning
D)   Small sample generalization

Question 18

Which is not a practical constraint facing the business researcher or data analyst?

Accepted Answer

A)   Time and money are always limited.
B)   The world is no laboratory,so some experiments are impractical.
C)   Research on human subjects is fraught with danger and ethical issues.
D)   Survey respondents usually will tell the truth if well compensated.

Question 19

Established risk factors such as cholesterol and obesity can predict who will get heart disease about 80 percent of the time.Adding a new test called CRP can raise this percentage to 81 percent-a statistically significant difference.But would this improvement be of practical importance to a physician? To a patient? Discuss.

Accepted Answer

In tests involving millions of patients,even a slightly improved test might benefit many individuals,though to the individual patient or physician the benefit might not be apparent.

Question 20

Which is least likely to be an application where statistics will be useful?

Accepted Answer

A)   Predicting whether an airfare is likely to rise or fall
B)   Designing the most desirable features for a ski pass
C)   Deciding whether offering Rice Krispies improves restaurant sales
D)   Choosing the wording of a corporate policy prohibiting smoking

Exam 1: Overview of Statistics

When a statistician omits data contrary to her findings in a study,she is justified as long as the sample supports her objective.

Correct Answer
verified

Descriptive statistics refers to summarizing data rather than generalizing about the population.

Correct Answer
verified

Which is not a likely area of application of statistics in business?

Correct Answer
verified

Valid statistical inferences cannot be made when sample sizes are small.

Correct Answer
verified

Estimating parameters and testing hypotheses are important aspects of descriptive statistics.

Correct Answer
verified

Which of the following statements is not true?

Correct Answer
verified

How might statistics be useful in determining the correct width of doorways in a convalescent care facility so that 99 percent of the "typical" wheelchairs can pass through the doorway without coming closer than 6 inches on either side?

Correct Answer
verified
Large samples could be taken of wheelcha...
View Answer

Which of the following statements is not true?

Correct Answer
verified
C

Statistics can help you handle either too little or too much information.

Correct Answer
verified

Pitfalls to consider in a statistical test include nonrandom samples,small sample size,and lack of causal links.

Correct Answer
verified

Statistics helps surmount language barriers to solve problems in multinational businesses.

Correct Answer
verified

Which is not an essential characteristic of a good business data analyst?

Correct Answer
verified

Because 25 percent of the students in my morning statistics class watch eight or more hours of television a week,I conclude that 25 percent of all students at the university watch eight or more hours of television a week.The most important logical weakness of this conclusion would be:

Correct Answer
verified

Which best illustrates the distinction between statistical significance and practical importance?

Correct Answer
verified

Excel has limited use in business because advanced statistical software is widely available.

Correct Answer
verified

A business data analyst needs a PhD in statistics.

Correct Answer
verified
False

"Tom's SUV rolled over.SUVs are dangerous." This best illustrates which fallacy?

Correct Answer
verified

Which is not a practical constraint facing the business researcher or data analyst?

Correct Answer
verified

Correct Answer
verified
In tests involving millions of patients,even a slightly improved test might benefit many individuals,though to the individual patient or physician the benefit might not be apparent.

Which is least likely to be an application where statistics will be useful?

Correct Answer
verified

Exam 1: Overview of Statistics

When a statistician omits data contrary to her findings in a study,she is justified as long as the sample supports her objective.

Correct AnswerverifiedShow Answer

Descriptive statistics refers to summarizing data rather than generalizing about the population.

Correct AnswerverifiedShow Answer

Which is not a likely area of application of statistics in business?

Correct AnswerverifiedShow Answer

Valid statistical inferences cannot be made when sample sizes are small.

Correct AnswerverifiedShow Answer

Estimating parameters and testing hypotheses are important aspects of descriptive statistics.

Correct AnswerverifiedShow Answer

Which of the following statements is not true?

Correct AnswerverifiedShow Answer

How might statistics be useful in determining the correct width of doorways in a convalescent care facility so that 99 percent of the "typical" wheelchairs can pass through the doorway without coming closer than 6 inches on either side?

Correct AnswerverifiedLarge samples could be taken of wheelcha...View AnswerShow Answer

Which of the following statements is not true?

Correct AnswerverifiedC

Statistics can help you handle either too little or too much information.

Correct AnswerverifiedShow Answer

Pitfalls to consider in a statistical test include nonrandom samples,small sample size,and lack of causal links.

Correct AnswerverifiedShow Answer

Statistics helps surmount language barriers to solve problems in multinational businesses.

Correct AnswerverifiedShow Answer

Which is not an essential characteristic of a good business data analyst?

Correct AnswerverifiedShow Answer

Because 25 percent of the students in my morning statistics class watch eight or more hours of television a week,I conclude that 25 percent of all students at the university watch eight or more hours of television a week.The most important logical weakness of this conclusion would be:

Correct AnswerverifiedShow Answer

Which best illustrates the distinction between statistical significance and practical importance?

Correct AnswerverifiedShow Answer

Excel has limited use in business because advanced statistical software is widely available.

Correct AnswerverifiedShow Answer

A business data analyst needs a PhD in statistics.

Correct AnswerverifiedFalse

"Tom's SUV rolled over.SUVs are dangerous." This best illustrates which fallacy?

Correct AnswerverifiedShow Answer

Which is not a practical constraint facing the business researcher or data analyst?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedIn tests involving millions of patients,even a slightly improved test might benefit many individuals,though to the individual patient or physician the benefit might not be apparent.

Which is least likely to be an application where statistics will be useful?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Large samples could be taken of wheelcha...
View Answer

Correct Answer
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C

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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False

Correct Answer
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Correct Answer
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Correct Answer
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In tests involving millions of patients,even a slightly improved test might benefit many individuals,though to the individual patient or physician the benefit might not be apparent.

Correct Answer
verified