2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
Lesson 1 Quiz
기한 5월26일 오후 11:59
배점 15
문제 12
사용 가능 5월26일 오후 11:59까지
시간 제한 30 Minutes
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질문 1
1 / 1점
Research question: In the population of all Olympic freestyle
wrestlers, is there a correlation between weight (in kilograms) and
height (in centimeters)?
Weight (in kilograms) is a quantitative variable.
Height (in centimeters) is a quantitative variable.
답변 1개:
정답입니다!
quantitative
답변 2개:
정답입니다!
quantitative
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2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
Both variables are numerical values with equal intervals. Both
are quantitative variables.
질문 2
0.5 / 1.5점
Research question: Can body temperature predict heart rate in
newborn mice?
In this research question the explanatory variable is
[ 선택 ]
and the response variable is
[ 선택 ]
.
The cases are the body temperatures .
답변 1개:
정답
러분의 답변은
body temperature
mice
답변 2개:
정답입니다!
heart rate
답변 3개:
러분의 답변은
정답
body temperatures
mice
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2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
The explanatory variable is used to predict the response
variable.
With body temperature predicting heart rate, body temperature
is the explanatory variable and heart rate is the response
variable.
질문 3
1 / 1점
At the beginning of one semester there were 500 students enrolled in
STAT 200 through Penn State World Campus. A random number
generator was used to select the names of 35 students who were
called and interviewed concerning their experiences in the course.
In this study, the 500 students enrolled in the course were the
population and the 35 students who were called and interviewed were
the sample .
답변 1개:
정답입니다!
population
답변 2개:
정답입니다!
sample
All students (i.e., the 500) are the population. The subset of the
population that was selected to be interviewed for the study was
the sample of 35.
질문 4
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1 / 1점
3/10
2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
Population: All students enrolled in World Campus sections of STAT
200 this semester
Sampling method: The names of all students are entered into a
spreadsheet and a random number generator is used to select 30
names from the list.
What type of sampling method is this an example of?
Convenience sampling
정답입니다!
Simple random sampling
A random number generator will provide a random sample. This
is an example of a simple random sampling method. All
students will have an equal probability of being selected.
질문 5
1 / 1점
After taking a proctored exam, Examity asks students to take a short
survey about their experience. About 5% of students complete the
survey. Most of these responses are extremely negative or extremely
positive.
Because only 5% of students complete the survey, which type of bias is
likely an issue here?
Response bias
정답입니다!
Non-response bias
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2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
The students who respond to the survey may be different from
those who do not response. This is non-response bias. People
are more likely to respond to a survey like this if they've had a
more extreme experience. This could be a very positive or very
negative experience. People with more neutral experiences are
less likely to take the time to submit the survey.
질문 6
1 / 1점
A group of kinesiology students wanted to know if individuals who took
group fitness classes lost more weight than individuals who worked out
on their own. They obtained a sample of 70 individuals who wanted to
lose weight. The first 35 participants to show up for the study were
assigned to the group fitness condition; they attended a group fitness
class twice a week. The second 35 participants were assigned to the
individual workout condition; they worked out alone in the gym twice a
week. Change in weight over a 15 week period was recorded and
compared for the two groups.
Is this an observational or experimental study?
Observational
정답입니다!
Experimental
The researchers assigned participants to the group or individual
workout conditions, thus this is an experimental study.
질문 7
1 / 1점
Decide if this study is experimental or observational.
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Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
A farmer wanted to know if hogs given FEED A weighed more than
hogs given FEED B. He gave hogs in one barn FEED A and hogs in a
second barn FEED B. After two weeks he weighed a sample of hogs
from each barn and found that those given FEED A did weigh more
than those given FEED B.
정답입니다!
Experimental
Observational
This is an experimental study because the farmer manipulated
the treatments (feed type) received by the subjects (hogs).
질문 8
1 / 1점
A research study is conducted to examine the relationship between
reading ability and math ability in a sample of public school children
(kindergarten - grade 12). They believe that students with higher scores
on a reading test will also have higher scores on a math test.
Which of the following is likely a confounding variable?
Math ability
Reading ability
정답입니다!
Age
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2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
A confounding variable is a characteristic that varies between
participants and is related to the other variables in a study.
Reading ability is the explanatory variable and math ability is the
response variable. Both of these are probably related to age.
We would expect older children to be better readers and to be
better at math.
질문 9
1.5 / 1.5점
Random sampling refers to randomly selecting participants from the
population.
Randomization refers to randomly assigning participants to different
groups.
답변 1개:
정답입니다!
Random sampling
답변 2개:
정답입니다!
Randomization
Randomization and random sampling are different concepts.
Random sampling refers to how the sample is selected from the
population.
Randomization refers to how participants are assigned to
different groups in an experiment.
질문 10
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1.5 / 1.5점
7/10
2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
Research question: Does smoking marijuana impact reaction times?
In one study 50 participants' reaction times were measured both before
and after they smoked marijuana. In other words, the same people
were measured before and after smoking. In this study the cases were
paired .
In a second study, 50 participants were assigned to smoke marijuana
and 48 participants were assigned to not smoke marijuana. Reaction
times were measured at the end of the study. In this study the cases
were independent .
답변 1개:
정답입니다!
paired
답변 2개:
정답입니다!
independent
In the first study both the before and after measurements were
taken from the same individuals. The data were paired by
individual.
In the second study the people in the two groups were
completely different and in no way paired. These were two
independent groups.
질문 11
1.5 / 1.5점
Research question: Are grades higher in STAT 200 or MATH 220?
In one study a sample of students who have taken both STAT 200 and
MATH 220 was obtained. Each student's STAT 200 score was
compared to their MATH 200 score. In this study the samples are
paired .
In a second study a sample of students who are only enrolled in STAT
200 was obtained as well as a sample of students who are only
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2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
enrolled in MATH 220. The average final grade of students in STAT 200
was compared to the average final grade of the students in MATH 220.
In this study the samples are independent .
답변 1개:
정답입니다!
paired
답변 2개:
정답입니다!
independent
In the first study the same students were taking the two courses.
In the second study there were different students taking each
course.
질문 12
평가 안 됨 / 2점
A. Describe a research study in which a double-blind design should
be used (as opposed to single-blind or no blinding).
B. Clearly explain why the double-blind design is appropriate in this
specific scenario.
Do not use a scenario from the online notes, lecture video, or textbook.
Most students will need about two sentences to address each part of
this question.
Your Answer:
In double-blind study participants and the researchers working directly
with them do not know who has been assigned to which condition.
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2020. 5. 25.
Lesson 1 Quiz: STAT 200, Section 308: Elem Statistics, WB, SU20
There are many possible correct answers.
퀴즈 점수: 12 / 15
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