BRM midterm
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
Identify the individuals.
a) Boaters
b) Boats
c) Environmental group members
d) Location, time of day, and number of boats - ANS-B ) boats
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
Identify the variables.
a) Boaters
b) Boats
c) Environmental group members
d) Location, time of day, and number of boats - ANS-d) Location, time of day, and number of
boats
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
Identify the response variable.
a) Number of boats
b) Time of day (morning, mid-day, afternoon, evening)
c) Location - ANS-a) Number of boats
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
True of False: This is an experiment.
TRUE
FALSE - ANS-False
Which of the following variables are of the categorical type?
a) Number of boats
b) Time of day (morning, mid-day, afternoon, evening)
c) Location
d) (A) and (B)
,e) (B) and (C) - ANS-e) (B) and (C)
You want to know the opinions of college students on the price of textbooks. 500 randomly
chosen college students are contacted. Of the 350 who participated, 275 said "yes, college
textbooks are affordable".
Identify the intended population.
a) All college students
b) 500 college students chosen for the study
c) 350 college students who responded
d) 275 college students who said "yes" - ANS-a) All college students
You want to know the opinions of college students on the price of textbooks. 500 randomly
chosen college students are contacted. Of the 350 who participated, 275 said "yes, college
textbooks are affordable".
Identify the sample.
a) All college students
b) 500 college students chosen for the study
c) 350 college students who responded
d) 275 college students who said "yes" - ANS-c) 350 college students who responded
You want to know the opinions of college students on the price of textbooks. 500 randomly
chosen college students are contacted. Of the 350 who participated, 275 said "yes, college
textbooks are affordable".
Identify the type of study. (Choose the best answer)
a) Observational study
b) Sample survey
c) Experiment
d) Census - ANS-b) Sample survey
In the 1950's Brachman study, workers at four goat hair mills were recruited into a study on an
anthrax vaccine. Workers were assigned to either have the vaccine or not. Rates of anthrax
contraction were compared between the two groups.
Identify the type of study.
a) Observational study
b) Sample survey
c) Experiment
d) Census - ANS-c) Experiment
, In the 1950's Brachman study, workers at four goat hair mills were recruited into a study on an
anthrax vaccine. Workers were assigned to either have the vaccine or not. Rates of anthrax
contraction were compared between the two groups.
Identify the response variable.
a)Goat hair mill
b)Vaccination group (vaccine or no vaccine)
c)Rate of anthrax contraction
d)Workers of the four goat hair mills - ANS-c)Rate of anthrax contraction
In a study of the effect of cigarette smoke on birth weight, researchers recorded the weight of
newborns for smoking and nonsmoking mothers across several labor and delivery wards.
Identify the intended population.
a) All babies
b)All pregnant women who smoke
c)Babies included in the study
d)Weight of newborns - ANS-a) All babies
A statistical study is said to be biased if
a)If it not a census
b) It the response variable is not well defined
c) it systematically favors a certain outcome
d) Repetitions of the same study yield different results - ANS-c) it systematically favors a certain
outcome
Teachers are asked to visit a website and give their opinion about a new rating system that is
based upon student test scores and is tied to their income.
Identify the type of study.
a)Convenience sample
b)Voluntary response
c) unbiased - ANS-b)Voluntary response
The school newspaper wants to find the opinions of students on availability of campus parking.
They send a staff member to stand outside a busy dorm and interview students as they walk in
or out of the building.
Identify the study type.
a) Convenience sample
b) Voluntary response
c) unbiased - ANS-a) Convenience sample
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
Identify the individuals.
a) Boaters
b) Boats
c) Environmental group members
d) Location, time of day, and number of boats - ANS-B ) boats
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
Identify the variables.
a) Boaters
b) Boats
c) Environmental group members
d) Location, time of day, and number of boats - ANS-d) Location, time of day, and number of
boats
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
Identify the response variable.
a) Number of boats
b) Time of day (morning, mid-day, afternoon, evening)
c) Location - ANS-a) Number of boats
An environmental group wants to study boat traffic on a large recreational lake. The group
watched and recorded the number of boats using the lake at several locations and times of day.
True of False: This is an experiment.
TRUE
FALSE - ANS-False
Which of the following variables are of the categorical type?
a) Number of boats
b) Time of day (morning, mid-day, afternoon, evening)
c) Location
d) (A) and (B)
,e) (B) and (C) - ANS-e) (B) and (C)
You want to know the opinions of college students on the price of textbooks. 500 randomly
chosen college students are contacted. Of the 350 who participated, 275 said "yes, college
textbooks are affordable".
Identify the intended population.
a) All college students
b) 500 college students chosen for the study
c) 350 college students who responded
d) 275 college students who said "yes" - ANS-a) All college students
You want to know the opinions of college students on the price of textbooks. 500 randomly
chosen college students are contacted. Of the 350 who participated, 275 said "yes, college
textbooks are affordable".
Identify the sample.
a) All college students
b) 500 college students chosen for the study
c) 350 college students who responded
d) 275 college students who said "yes" - ANS-c) 350 college students who responded
You want to know the opinions of college students on the price of textbooks. 500 randomly
chosen college students are contacted. Of the 350 who participated, 275 said "yes, college
textbooks are affordable".
Identify the type of study. (Choose the best answer)
a) Observational study
b) Sample survey
c) Experiment
d) Census - ANS-b) Sample survey
In the 1950's Brachman study, workers at four goat hair mills were recruited into a study on an
anthrax vaccine. Workers were assigned to either have the vaccine or not. Rates of anthrax
contraction were compared between the two groups.
Identify the type of study.
a) Observational study
b) Sample survey
c) Experiment
d) Census - ANS-c) Experiment
, In the 1950's Brachman study, workers at four goat hair mills were recruited into a study on an
anthrax vaccine. Workers were assigned to either have the vaccine or not. Rates of anthrax
contraction were compared between the two groups.
Identify the response variable.
a)Goat hair mill
b)Vaccination group (vaccine or no vaccine)
c)Rate of anthrax contraction
d)Workers of the four goat hair mills - ANS-c)Rate of anthrax contraction
In a study of the effect of cigarette smoke on birth weight, researchers recorded the weight of
newborns for smoking and nonsmoking mothers across several labor and delivery wards.
Identify the intended population.
a) All babies
b)All pregnant women who smoke
c)Babies included in the study
d)Weight of newborns - ANS-a) All babies
A statistical study is said to be biased if
a)If it not a census
b) It the response variable is not well defined
c) it systematically favors a certain outcome
d) Repetitions of the same study yield different results - ANS-c) it systematically favors a certain
outcome
Teachers are asked to visit a website and give their opinion about a new rating system that is
based upon student test scores and is tied to their income.
Identify the type of study.
a)Convenience sample
b)Voluntary response
c) unbiased - ANS-b)Voluntary response
The school newspaper wants to find the opinions of students on availability of campus parking.
They send a staff member to stand outside a busy dorm and interview students as they walk in
or out of the building.
Identify the study type.
a) Convenience sample
b) Voluntary response
c) unbiased - ANS-a) Convenience sample
