MATH 1280 Introduction to Statistics
Exam Questions With Correct Answers
The |population |in |this |survey |is: |- |CORRECT |ANSWER✔✔-The |target |of |the |survey |is |to |assess |
the |service |that |costumers |get |at |the |dealerships.
The |correct |answer |is: |Customers |that |arrive |at |dealerships |of |the |company.
The |sample |in |this |survey |is: |- |CORRECT |ANSWER✔✔-that |arrive |at |the |selected |dealerships |
during |the |day |of |visit.
A |parameter |that |may |be |targeted |by |this |survey |is: |- |CORRECT |ANSWER✔✔-The |percentage |
of |costumers |that |possess |a |car |made |by |the |company.
A |statistic |that |may |be |used |to |summarize |the |outcome |of |the |survey |is: |- |CORRECT |
ANSWER✔✔-The |percentage, |among |costumers |that |were |interviewed, |of |those |that |do |not |
possess |a |car |made |by |the |company
The |data |used |to |produce |the |tables |and |plots |is: |- |CORRECT |ANSWER✔✔-A |sample.
The |average |number |of |calls |that |arrived |between |8:00 |AM |and |8:10 |AM |during |the |working |
days |of |any |month |is: |- |CORRECT |ANSWER✔✔-A |parameter.
The |average |number |of |calls |recorded |in |the |object |"Feb" |is |5.85. |The |average |in |the |object
|"Sep" |is |8.5. |The |difference |between |these |two |numbers |is: |- |CORRECT |ANSWER✔✔-A |
statistic.
In |which |of |the |months |the |number |of |incoming |calls |between |8:00 |AM |and |8:10 |AM |tends |to
|be |smaller? |- |CORRECT |ANSWER✔✔-February.
,The |height |of |the |fourth |bar |from |the |left |of |the |bar |plot |for |the |month |of |February |
represents |the |fact |that? |- |CORRECT |ANSWER✔✔-In |4 |of |the |days |of |the |month |of |February |
there |were |5 |incoming |calls.
The |location |of |the |highest |bar |of |the |bar |plot |for |the |month |of |September |represents |the |
fact |that? |- |CORRECT |ANSWER✔✔-10 |incoming |calls |came |during |6 |days |of |the |month |of |
September.
The |next |two |questions |refer |to |the |following |relative |frequency |table |on |hurricanes |that |have
|made |direct |hits |on |the |U.S. |between |1851 |and |2004. |Hurricanes |are |given |a |strength |
category |rating |based |on |the |minimum |wind |speed |generated |by |the |storm.
|(http://www.nhc.noaa.gov/gifs/table5.gif |) |(ALTERNATE |DOWNLOAD |LINK) |- |CORRECT |
ANSWER✔✔-
What |is |the |relative |frequency |of |direct |hits |that |were |category |2 |hurricanes? |- |CORRECT |
ANSWER✔✔-0.2637
The |relative |frequency |of |direct |hits |that |were |AT |LEAST |a |category |3 |storm |is |- |CORRECT |
ANSWER✔✔-0.337
Sixty |adults |with |gum |disease |were |asked |the |number |of |times |per |week |they |used |to |floss |
before |their |diagnoses. |The |(incomplete) |results |are |shown |below:
Flossing |Frequency |for |Adults |with |Gum |Disease# |per |WeekFreq.Relative |Freq.Cum. |Relative |
Freq.0270.4500 |118 |3 |0.933363 |710.0167
Fill |in |the |blanks |in |the |table |and |answer |the |next |two |question: |(The |numerical |answer |that |
you |provide |should |be |of |the |form |"0.xxxx", |with |4 |digits |to |the |right |of |the |zero.) |- |CORRECT |
ANSWER✔✔-
The |relative |frequency |that |flossed |6 |times |per |week |is: |- |CORRECT |ANSWER✔✔-0.05
The |relative |frequency |that |flossed |at |least |once |a |week |is: |- |CORRECT |ANSWER✔✔-0.55
, The |number |of |malfunctioning |products |per |production |series |was |recorded |for |several |
production |series. |The |data |was |entered |into |an |R |object |by |the |name |"malfunction". |The |
next |3 |questions |refer |to |the |following |R |code: |- |CORRECT |ANSWER✔✔-
The |sample |size |is: |- |CORRECT |ANSWER✔✔-72
The |frequency |of |production |series |where |there |are |4 |malfunctioning |products |is: |- |CORRECT |
ANSWER✔✔-16
The |frequency |of |production |series |where |there |are |less |than |7 |malfunctioning |products |is: |- |
CORRECT |ANSWER✔✔-70
The |file |"ex2.csv" |contains |information |on |the |blood |pressure |of |a |group |of |healthy |
individuals. |The |file |is |located |in |http://pluto.huji.ac.il/~msby/StatThink/Datasets/ex2.csv. |
(ALTERNATE |DOWNLOAD |LINK) |Read |the |data |into |R |and |answer |the |following |4 |questions |- |
CORRECT |ANSWER✔✔-
The |number |of |variables |is: |- |CORRECT |ANSWER✔✔-7
The |type |of |the |variable |"id" |is: |- |CORRECT |ANSWER✔✔-factor
The |type |of |the |variable |"sex" |is: |- |CORRECT |ANSWER✔✔-factor
The |type |of |the |variable |"diastolic" |is: |- |CORRECT |ANSWER✔✔-numeric
A |study |was |done |to |determine |the |age, |type |of |activity, |number |of |times |per |week |and |the |
duration |(amount |of |time) |of |resident |use |of |a |local |park |in |San |Jose. |The |first |house |in |the |
neighborhood |around |the |park |was |selected |randomly |and |then |every |8th |house |in |the |
Exam Questions With Correct Answers
The |population |in |this |survey |is: |- |CORRECT |ANSWER✔✔-The |target |of |the |survey |is |to |assess |
the |service |that |costumers |get |at |the |dealerships.
The |correct |answer |is: |Customers |that |arrive |at |dealerships |of |the |company.
The |sample |in |this |survey |is: |- |CORRECT |ANSWER✔✔-that |arrive |at |the |selected |dealerships |
during |the |day |of |visit.
A |parameter |that |may |be |targeted |by |this |survey |is: |- |CORRECT |ANSWER✔✔-The |percentage |
of |costumers |that |possess |a |car |made |by |the |company.
A |statistic |that |may |be |used |to |summarize |the |outcome |of |the |survey |is: |- |CORRECT |
ANSWER✔✔-The |percentage, |among |costumers |that |were |interviewed, |of |those |that |do |not |
possess |a |car |made |by |the |company
The |data |used |to |produce |the |tables |and |plots |is: |- |CORRECT |ANSWER✔✔-A |sample.
The |average |number |of |calls |that |arrived |between |8:00 |AM |and |8:10 |AM |during |the |working |
days |of |any |month |is: |- |CORRECT |ANSWER✔✔-A |parameter.
The |average |number |of |calls |recorded |in |the |object |"Feb" |is |5.85. |The |average |in |the |object
|"Sep" |is |8.5. |The |difference |between |these |two |numbers |is: |- |CORRECT |ANSWER✔✔-A |
statistic.
In |which |of |the |months |the |number |of |incoming |calls |between |8:00 |AM |and |8:10 |AM |tends |to
|be |smaller? |- |CORRECT |ANSWER✔✔-February.
,The |height |of |the |fourth |bar |from |the |left |of |the |bar |plot |for |the |month |of |February |
represents |the |fact |that? |- |CORRECT |ANSWER✔✔-In |4 |of |the |days |of |the |month |of |February |
there |were |5 |incoming |calls.
The |location |of |the |highest |bar |of |the |bar |plot |for |the |month |of |September |represents |the |
fact |that? |- |CORRECT |ANSWER✔✔-10 |incoming |calls |came |during |6 |days |of |the |month |of |
September.
The |next |two |questions |refer |to |the |following |relative |frequency |table |on |hurricanes |that |have
|made |direct |hits |on |the |U.S. |between |1851 |and |2004. |Hurricanes |are |given |a |strength |
category |rating |based |on |the |minimum |wind |speed |generated |by |the |storm.
|(http://www.nhc.noaa.gov/gifs/table5.gif |) |(ALTERNATE |DOWNLOAD |LINK) |- |CORRECT |
ANSWER✔✔-
What |is |the |relative |frequency |of |direct |hits |that |were |category |2 |hurricanes? |- |CORRECT |
ANSWER✔✔-0.2637
The |relative |frequency |of |direct |hits |that |were |AT |LEAST |a |category |3 |storm |is |- |CORRECT |
ANSWER✔✔-0.337
Sixty |adults |with |gum |disease |were |asked |the |number |of |times |per |week |they |used |to |floss |
before |their |diagnoses. |The |(incomplete) |results |are |shown |below:
Flossing |Frequency |for |Adults |with |Gum |Disease# |per |WeekFreq.Relative |Freq.Cum. |Relative |
Freq.0270.4500 |118 |3 |0.933363 |710.0167
Fill |in |the |blanks |in |the |table |and |answer |the |next |two |question: |(The |numerical |answer |that |
you |provide |should |be |of |the |form |"0.xxxx", |with |4 |digits |to |the |right |of |the |zero.) |- |CORRECT |
ANSWER✔✔-
The |relative |frequency |that |flossed |6 |times |per |week |is: |- |CORRECT |ANSWER✔✔-0.05
The |relative |frequency |that |flossed |at |least |once |a |week |is: |- |CORRECT |ANSWER✔✔-0.55
, The |number |of |malfunctioning |products |per |production |series |was |recorded |for |several |
production |series. |The |data |was |entered |into |an |R |object |by |the |name |"malfunction". |The |
next |3 |questions |refer |to |the |following |R |code: |- |CORRECT |ANSWER✔✔-
The |sample |size |is: |- |CORRECT |ANSWER✔✔-72
The |frequency |of |production |series |where |there |are |4 |malfunctioning |products |is: |- |CORRECT |
ANSWER✔✔-16
The |frequency |of |production |series |where |there |are |less |than |7 |malfunctioning |products |is: |- |
CORRECT |ANSWER✔✔-70
The |file |"ex2.csv" |contains |information |on |the |blood |pressure |of |a |group |of |healthy |
individuals. |The |file |is |located |in |http://pluto.huji.ac.il/~msby/StatThink/Datasets/ex2.csv. |
(ALTERNATE |DOWNLOAD |LINK) |Read |the |data |into |R |and |answer |the |following |4 |questions |- |
CORRECT |ANSWER✔✔-
The |number |of |variables |is: |- |CORRECT |ANSWER✔✔-7
The |type |of |the |variable |"id" |is: |- |CORRECT |ANSWER✔✔-factor
The |type |of |the |variable |"sex" |is: |- |CORRECT |ANSWER✔✔-factor
The |type |of |the |variable |"diastolic" |is: |- |CORRECT |ANSWER✔✔-numeric
A |study |was |done |to |determine |the |age, |type |of |activity, |number |of |times |per |week |and |the |
duration |(amount |of |time) |of |resident |use |of |a |local |park |in |San |Jose. |The |first |house |in |the |
neighborhood |around |the |park |was |selected |randomly |and |then |every |8th |house |in |the |
