STAT's Exam 1 questions with verified
answers already passed
The study of statistics rests on? - correct answer ✔✔Variation and Data
The circles shown to the right are similar, but not exactly the same. This is an
example of? - correct answer ✔✔Variation
Data are more than just numbers, because data have _____. - correct answer
✔✔Context
Stacked Data
Converting Stacked to unstacked - correct answer ✔✔
In statistics, variables are_______. - correct answer ✔✔Characteristics of people
and things.
In statistics, the data we work with is just one part of a bigger picture called the
____. - correct answer ✔✔Population
Which of the following questions should be asked when developing an
understanding of data? - correct answer ✔✔What variables wereWh measured?
How were the variables measured?
,Who collected the data?
(All of these questions are important.)
What are two basic types of variables in statistics? - correct answer ✔✔Numerical
and categorical
The variable "eye color" is an example of what type of variable? - correct answer
✔✔Categorical
Categorical variables are also referred to as ______ variables. - correct answer
✔✔qualitative
The process of representing categorical variables with numbers (such as letting a 1
represent "smoker" and a 0 represent "non-smoker") is called _______. - correct
answer ✔✔Coding
It was predicted that a country will have an elderly population (65 and older) of
8,448,000 in the year 2050 and that this will be 19.3% of the population. What is
the total predicted population of this country in 2050? - correct answer ✔✔The
total predicted population of the country in 2050 is 43,772,000
people.
8448000/0.193=43772020.725389
, It was predicted that a country will have an elderly population (65 and older) of
8,170,000 in the year 2050 and that this will be 22.5% of the population. What is
the total predicted population of this country in 2050? - correct answer ✔✔The
total predicted population of the country in 2050 is 36311000 people.
It was reported in 2007 that there were 8,987,000 people age 16 or older who had
a "go outside the home" disability and that this was 23.1% of the population (of
this age group). These are people who cannot go outside the home without help.
How large was the total population (of this age group) in 2007? - correct answer
✔✔The population in 2007 of people (of this age group) 38905000 is people.
8987000/0.231=38904761.904762
Two sections of statistics are offered, the first at 8 a.m. and the second at 10 a.m.
The 8 a.m. section has 25 women, and the 10 a.m. section has 15 women. A
student claims this is evidence that women prefer earlier statistics classes than
men do. What information is missing that might contradict this claim? - correct
answer ✔✔The percentage of female students in the two classes is unknown.
There may be more females in the 8 a.m. because there are more students in the
8 a.m. class than the 10 a.m. class. This claim could be true only if the classes
were the same size.
In 2008, a highway safety administration reported that the number of pedestrian
fatalities in City A was 65 and that the number in City B was 45. Can we conclude
that pedestrians are safer in City B? Why or why not? - correct answer ✔✔No, in
order to compare the fatalities the statistics must include the number of fatalities
per pedestrian. There may be fewer pedestrians in City B causing the difference.
answers already passed
The study of statistics rests on? - correct answer ✔✔Variation and Data
The circles shown to the right are similar, but not exactly the same. This is an
example of? - correct answer ✔✔Variation
Data are more than just numbers, because data have _____. - correct answer
✔✔Context
Stacked Data
Converting Stacked to unstacked - correct answer ✔✔
In statistics, variables are_______. - correct answer ✔✔Characteristics of people
and things.
In statistics, the data we work with is just one part of a bigger picture called the
____. - correct answer ✔✔Population
Which of the following questions should be asked when developing an
understanding of data? - correct answer ✔✔What variables wereWh measured?
How were the variables measured?
,Who collected the data?
(All of these questions are important.)
What are two basic types of variables in statistics? - correct answer ✔✔Numerical
and categorical
The variable "eye color" is an example of what type of variable? - correct answer
✔✔Categorical
Categorical variables are also referred to as ______ variables. - correct answer
✔✔qualitative
The process of representing categorical variables with numbers (such as letting a 1
represent "smoker" and a 0 represent "non-smoker") is called _______. - correct
answer ✔✔Coding
It was predicted that a country will have an elderly population (65 and older) of
8,448,000 in the year 2050 and that this will be 19.3% of the population. What is
the total predicted population of this country in 2050? - correct answer ✔✔The
total predicted population of the country in 2050 is 43,772,000
people.
8448000/0.193=43772020.725389
, It was predicted that a country will have an elderly population (65 and older) of
8,170,000 in the year 2050 and that this will be 22.5% of the population. What is
the total predicted population of this country in 2050? - correct answer ✔✔The
total predicted population of the country in 2050 is 36311000 people.
It was reported in 2007 that there were 8,987,000 people age 16 or older who had
a "go outside the home" disability and that this was 23.1% of the population (of
this age group). These are people who cannot go outside the home without help.
How large was the total population (of this age group) in 2007? - correct answer
✔✔The population in 2007 of people (of this age group) 38905000 is people.
8987000/0.231=38904761.904762
Two sections of statistics are offered, the first at 8 a.m. and the second at 10 a.m.
The 8 a.m. section has 25 women, and the 10 a.m. section has 15 women. A
student claims this is evidence that women prefer earlier statistics classes than
men do. What information is missing that might contradict this claim? - correct
answer ✔✔The percentage of female students in the two classes is unknown.
There may be more females in the 8 a.m. because there are more students in the
8 a.m. class than the 10 a.m. class. This claim could be true only if the classes
were the same size.
In 2008, a highway safety administration reported that the number of pedestrian
fatalities in City A was 65 and that the number in City B was 45. Can we conclude
that pedestrians are safer in City B? Why or why not? - correct answer ✔✔No, in
order to compare the fatalities the statistics must include the number of fatalities
per pedestrian. There may be fewer pedestrians in City B causing the difference.
