Essential Statistics 3rd Edition Gould, Ryan & Wong Test Bank | Complete Study Guide & Answers

TESTBANK
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,MULTIPLE CHOICE. n




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 n n n n




C) 67 n D) 256 n




Answer: B n




2) A two-way table could be used for which of the following pairs of variables?
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A) Gender and age B) Age and favorite class n n n n n n




C) Gender and favorite class n D)Age and height n n n n n n




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 n n n




Answer: B
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SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
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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.
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1

,MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
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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
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use? n




A) Use Commute Distance (Miles) and Living Situation. n n n n n n




B) Data on student's living situation are not included in this study. n n n n n n n n n n




C) Use Commute Distance (Miles) and College Units Acquired. n n n n n n n




D) UseCollege Units Acquired and Living Situation. n n n n n n




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 girls want to be a teacher when they grow up?
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A) 45.6% B) 80.8% C) 8.7% n n D) 19.2%n




Answer: D n




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 n n n n




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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8) n




example of what type of variable?
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A) Numerical variable B) Categorical variable C)Neither n n n n




Answer: A
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2

, SHORT ANSWER. Write the word orphrase that best completes each statement or answers the question.
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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
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the problem.
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10) A two-way table is useful for describing which types of variables?
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A) One numerical variable. n n




B) Two categorical variables. n n




C) One numerical variable and one categorical variable.
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D) Two numerical variables. n n




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 n n




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 unstacked data because each row 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 the question.
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12) According to the following two-way table, why are percentages more useful than counts to
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12) n




compare the amount of males and females who eat breakfast?
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Answer: The group sizes are different. There are 55 males, but only45 females.
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