Test bank for Essential Statistics, 3rd Edition, Robert N. Gould, Colleen Ryan, Rebecca Wong., All chapters

TESTBANK
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,MULTIPLE CHOICE. e




Choose the one alternative that best completes the statement or answers the question.
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Solve the problem.
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1) In a sample of 775 senior citizens, approximately 67% said that they had seen a television
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commercial for life insurance. About how many senior citizens is this?
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A) Not enough information available. B) 519 e e e e




C) 67 e D) 256 e




Answer: B e




2) Atwo-waytable couldbe used for which of the following pairs of variables?
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A) Genderand age B) Age andfavorite class e e e e e e




C) Gender and favorite class e D)Age andheight e e e e e e




Answer: C
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Indicate whether the study described is an observational study or a controlled experiment.
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3) "People with diabetes are at higher risk for certain cancers than those without the blood sugar
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disease, suggests a new study based on a telephone survey of nearly 400,000 adults."
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A) Controlled experiment B)Observational study e e e




Answer: B
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SHORT ANSWER. Write the word orphrase that best completes each statement or answers thequestion.
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Answer the question.
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4) The number of clinically obese men in State A is 156,261 and the number of clinically obese men
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in State B is 294,269. Someone makes the claim that this is evidence that men exercise more in
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State A. What information is missing that might contradict this claim?
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Answer: We need to know the total number of men in State A and State B so that a
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comparison can be made of the percentage of the men in each state that are clinically
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obese. There could be a much higher male population in State B than State A. Also,
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assumptions about exercise and obesity are being made. e e e e e e e e




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,MULTIPLE CHOICE. Choose theone alternative that best completes the statement or answers thequestion.
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Use the data in Table 1A to answer the question.
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Note: 1 is female, 0 is male.
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5) Suppose you wanted to know whether the student's commute distance was associated with the
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student's living situation. Using the data table if possible, which variables would you use?
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A) Use Commute Distance (Miles) and Living Situation. e e e e e e




B) Data on student's living situation are not included in this study.
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C) Use Commute Distance (Miles) and College Units Acquired.e e e e e e e




D) UseCollegeUnitsAcquired andLivingSituation. e e e e e e




Answer: A
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In a study of 1350 elementary school children, 118 out of the 615 girls in the study said they want to be a teacher when they
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grow up.
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6) What percent of girlswant to be a teacher when they grow up?
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A) 45.6% B) 80.8% C) 8.7% e e D) 19.2% e




Answer: D e




Determine if the following scenario is an observational study or a controlled experiment.
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7) A doctor is interested in determining whether a certain medication increases the risk of high blood
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pressure. He randomly selects 100 people for his study - 50 who will take the medication, and 50 who
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will take a placebo. He checks the patients' blood pressures weekly for six months.
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A) Observational study B) Neither C) Controlled experiment e e e e




Answer: C
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Solve the problem.
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8) The number of parents who attended parent teacher conferences at a local elementary school is an
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example of what type of variable?
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A) Numerical variable B) Categorical variable C)Neither e e e e




Answer: A
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2

, SHORT ANSWER. Write the word orphrase that best completes each statement or answers thequestion.
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Determine if the following scenario is an observational study or a controlled experiment and explain your reasoning.
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9) A doctor is interested in determining whether a certain medication is effective at treating
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abdominal pain. He reviews his patients' medical records and finds that a higher
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proportion of people who took the medication fewer abdominal pain symptoms than those
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who did not take the medication.
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Answer: This is an observational study because the doctor did not randomly assign patients
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into groups. Instead, he simply looked at medical files.
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the
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e problem.
10) Atwo-waytable is useful for describing whichtypes of variables?
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A) One numerical variable. e e




B) Two categorical variables. e e




C) One numerical variable and one categorical variable.
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D) Twonumerical variables. e e




Answer: B
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11) The following data table is organized using which method?
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Gender Age
Male 35
Female 42
Female 33
Male 37
Female 39 e e




A) This is stacked data because each row represents one person.
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B) This is unstacked data because the ages are separated by groups (in this case, gender).
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C) This is stacked data because the ages are separated by groups (in this case, gender).
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D) This is unstackeddata becauseeachrow represents one person.
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Answer: A
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SHORT ANSWER. Write the word orphrase that best completes each statement or answers thequestion.
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12) According to the following two-way table, why are percentages more useful than counts to
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compare the amount of males and females who eat breakfast?
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Answer: Thegroupsizes aredifferent. There are 55 males, butonly45 females.
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