Statistics Test 1
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1. Is the number of points scored Discreet. The possible values are 0, 1,
during a basketball game continu- 2...
ous or discreet?
2. Is the time required to download Continuous. The possible values are
a file from the internet discreet or t>0
continuous?
3. y=808.8x+11,607 where y is medi- Substitution 30 for x to find median
an income and x is the percentage income.
25 years and older with at least a y=35,871
bachelors degree. Predict the me-
dian income of a region in which
30% of adults 25 years and older
have at least a bachelors degree.
4. y=808.8x+11,607 where y is medi- Substitute 26.8 for x to find the predict-
an income and x is the percentage ed median income and then compare.
25 years and older with at least y=33,383
a bachelors degree. I'm a partic- lower
ular region, 26.8 perfect of adults
25 years and older have at least a
bachelors degree. The median in-
come of this region is 29,792. Is
this income higher than what you
would expect? Why?
5. y=808.8x+11,607 where y is medi- The slope is 808.8
an income and x is the percentage For every perfect increase in adults
25 years and older with at least having at least a bachelors degree, the
a bachelors degree. Interpret the median income increases by 808.80,
slope. on average.
6. y=808.8x+11,607 where y is medi- It does not make sense to interpret the
an income and x is the percentage y-intercept because an x-value or 0 is
25 years and older with at least a outside the scope of the model.
bachelors degree. Explain why it
does not make sense to interpret
the y-intercept.
, Statistics Test 1
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7. Define statistics Statistics is the science of collecting,
organizing, summarizing, and analyz-
ing information to draw a conclusion
and answer questions. In addition, sta-
tistics is about providing a measure of
confidence in any conclusions.
8. A(n)____is a person or object that Individual
is a member of the population be-
ing studied.
9. Inferential statistics Uses methods that generalize results
obtained from a sample to the popula-
tion and measure the reliability of the
results.
10. Descriptive statistics Consists of organizing and summariz-
ing information collected
11. Statistic Numerical summary of a sample
12. Parameter Numerical summary of a population
13. In a national survey of high school The value is a statistic because the
students (grades 9 to 12), 25% of respondents who were high school stu-
the students who responded re- dents (grades 9 to 12) are a sample.
ported that someone had offered ,
sold, or given them an illegal drug
in school property. Is the value a
parameter or a statistic?
14. One of the greatest baseball hit- The value is a parameter because the
ters of all time has a career batting career at-bats of a baseball player are
average of 0.366. Is the value a pa- a population.
rameter or a statistic?
15. Number of brothers. Is the variable The variable is quantitative because it
qualitative or quantitative? is a numerical measure.
16.
, Statistics Test 1
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Number of students in a class. Is The variable is discreet because it is
the variable discrete or continu- countable.
ous?
17. Amount of water in a dogs bowl. The variable is continuous because it
Is the variable discreet or continu- is not countable.
ous?
18. A polling organization contacts Adult women who are 30 to 70 years of
1512 adult women who are 30 to 70 age and live in the United States.
years of age and live in the Unit-
ed States and asks whether or not
they had received a mammogram
during the last year. What is the
population in the study?
19. A polling organization contacts The 1512 adult women who are 30 to
1512 adult women who are 30 to 70 70 years of age and live in the United
years of age and live in the Unit- States.
ed States and asks whether or not
they had received a mammogram
during the last year. What is the
sample in the study?
20. A quality control manager ran- All the bottles of apple juice produced
domly selects 40 bottles of apple in the plant on December 22.
juice that were filled on December
22 to assess the calibration of the
filling machine. What is the popu-
lation in the study?
21. A polling organization contacts The 40 bottles of apple juice selected
1512 adult women who are 30 to 70 in the plant on December 22.
years of age and live in the Unit-
ed States and asks whether or not
they had received a mammogram
during the last year. What is the
sample in the study?
22. What is an observational study?
, Statistics Test 1
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An observational study measures the
value of the response variable with-
out attempting to influence the value
of either the response or explanatory
variables.
23. What is a designed experiment? A designed experiment is when a re-
searcher assigns individuals to a cer-
tain group, intentionally changing the
value of an explanatory variable, and
then recording the value of the re-
sponse variable for each group.
24. Which allows the researcher to Designed experiment
claim causation between an ex-
planatory variable and a response
variable?
25. What is meant by confounding? Confounding in a study occurs when
the effects of two or more explanatory
variables are not separated. Therefore,
any relation that may exist between an
explanatory variable and the response
variable may be due to some other
variable or variables not accounted for
in the study.
26. What is a lurking variable? Explanatory variable that was not con-
sidered in a study, but that affects the
value of the response variable in the
study. In addition, lurking variables are
typically related to explanatory vari-
ables in the study.
27. What is a confounding variable? An explanatory variable that was con-
sidered in a study whose effect can-
not be distinguished from a second ex-
planatory variable in the study.
28. What is a cross-sectional study?
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