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

TEST BANK
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,MULTIPLE |CHOICE.
Choose |the |one |alternative |that |best |completes |the |statement |or |answers |the |question.

Solve |the |problem.
1) In |a |sample |of |775 |senior |citizens, |approximately |67% |said |that |they |had |seen |a 1) |

|television |commercial | for |life |insurance. | About | how | many | senior | citizens | is

| this?

A) Not |enough |information |available. B) | 519
C) |67 D) |256
Answer: | B

2) A |two-way |table |could |be |used |for |which |of |the |following |pairs |of |variables? 2) |

A) Gender |and |age B) |Age |and |favorite |class
C) |Gender |and |favorite |class D) |Age |and
height |Answer: | C
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Indicate |whether |the |study |described |is |an |observational |study |or |a |controlled |experiment.
3) "People |with |diabetes |are |at |higher |risk |for |certain |cancers |than |those |without |the |blood 3) |

|sugar |disease, | suggests | a | new | study | based | on | a |telephone | survey | of |nearly

| 400,000 | adults."

A) Controlled |experiment B) |Observational |study
Answer: | B
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SHORT |ANSWER. |Write |the |word |or |phrase |that |best |completes |each |statement |or |answers |the |question.

Answer |the |question.
4) The |number |of |clinically |obese |men |in |State |A |is |156,261 |and |the |number |of |clinically 4) |

|obese |men |in |State |B |is |294,269. |Someone |makes |the |claim |that |this |is |evidence |that

|men |exercise |more | in | State | A. | What | information |is | missing | that | might |contradict

|this |claim?


Answer: | We | need | to | know | the | total | number | of | men | in | State | A | and | State | B | so
| that | a |comparison |can |be |made |of |the |percentage |of |the |men |in |each |state |that

|are |clinically |obese. |There |could |be |a |much |higher | male |population |in |State | B

|than |State |A. |Also, |assumptions |about |exercise |and |obesity |are |being |made.




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,MULTIPLE |CHOICE. |Choose |the |one |alternative |that |best |completes |the |statement |or |answers |the
|question.
Use |the |data |in |Table |1A |to |answer | the |question.




Note: |1 |is |female, |0 |is |male.


5) Suppose |you |wanted |to |know |whether |the |student's |commute |distance |was |associated |with 5) |

|the |student's | living |situation. | Using | the | data |table |if | possible, |which |variables

| would |you | use?

A) Use |Commute |Distance |(Miles) |and |Living |Situation.
B) Data |on |student's |living |situation |are |not |included |in |this |study.
C) Use |Commute |Distance |(Miles) |and |College |Units |Acquired.
D) Use |College |Units |Acquired |and |Living
|Situation. |Answer: | A

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 |grow |up.

6) What |percent |of |girls |want |to |be |a |teacher |when |they |grow |up? 6)
A) 45.6% B) |80.8% C) |8.7% D) |19.2%
Answer: |D

Determine |if |the |following |scenario |is |an |observational |study |or |a |controlled |experiment.
7) A |doctor |is |interested |in |determining |whether |a |certain |medication |increases |the |risk |of |high 7) |

|blood |pressure. |He |randomly |selects |100 |people |for |his |study |- |50 |who |will |take |the

|medication, |and |50 |who | will |take | a |placebo. | He |checks |the | patients' | blood | pressures

| weekly |for | six | months.

A) Observational |study B) |Neither C) |Controlled |experiment
|Answer: | C

Solve |the |problem. 8) |

8) The |number |of |parents |who |attended |parent |teacher |conferences |at |a |local |elementary |school
|is |an |example |of |what |type |of |variable?

A) Numerical |variable B) |Categorical |variable C) |Neither
|Answer: | A




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, SHORT |ANSWER. |Write |the |word |or |phrase |that |best |completes |each |statement |or |answers |the
|question.
Determine |if |the |following |scenario |is |an |observational |study |or |a |controlled |experiment |and |explain |your |reasoning.
9) A |doctor |is |interested |in |determining |whether |a |certain |medication |is |effective |at 9) |
|treating |abdominal | pain. | He | reviews | his | patients' | medical | records | and | finds

| that | a | higher |proportion |of |people |who |took |the |medication |fewer |abdominal |pain

|symptoms |than |those |who |did |not |take |the |medication.


Answer: |This |is |an |observational |study |because |the |doctor |did |not |randomly |assign
|patients |into |groups. |Instead, |he |simply |looked |at |medical |files.




MULTIPLE |CHOICE. | Choose |the |one |alternative |that |best |completes |the |statement |or |answers |the |question.

Solve |the |problem.
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10) A |two-way |table |is |useful |for |describing |which |types |of |variables? 10) |

A) One |numerical |variable.
B) Two |categorical |variables.
C) One |numerical |variable |and |one |categorical |variable.
D) Two |numerical
variables. |Answer: | B
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11) The |following |data |table |is |organized |using |which |method? 11) |




Gender Age
Male 35
Female 42
Female 33
Male 37
Female | 39 |
A) This |is |stacked |data |because |each |row |represents |one |person.
B) This |is |unstacked |data |because |the |ages |are |separated |by |groups |(in |this |case, |gender).
C) This |is |stacked |data |because | the |ages |are |separated |by |groups |(in |this |case, |gender).
D) This |is |unstacked |data |because |each |row |represents |one
person. |Answer: | A
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SHORT |ANSWER. |Write |the |word |or |phrase |that |best |completes |each |statement |or |answers |the |question.

12) According |to |the |following |two-way |table, |why |are |percentages |more |useful |than 12) |

|counts |to |compare | the | amount |of |males |and |females |who |eat |breakfast?




Answer: |The |group |sizes |are |different. |There |are |55 |males, |but |only|45 |females.




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