CHLD-3301.793 Introductory Statistics Week 1-7 Exam 109
Questions with Verified Answers
Men's t-shirt sizes are classified as small, medium, large, extra large, and double
extra large. This is an example of measurement on a nominal scale. - CORRECT
ANSWER False
If a set of exam scores forms a negatively skewed distribution, it suggests that the
majority of the students scored well on the exam (where higher scores indicate
better performance). - CORRECT ANSWER True
The tools of descriptive statistics enable one to simplify, summarize, and organize
data. - CORRECT ANSWER True
After measuring a sample of individuals, a researcher finds that one participant's
score is bigger than another participant's score, but the researcher can't specify
how much bigger. The measurements must come from a(n) ____ scale. - CORRECT
ANSWER Ordinal
The class of statistical techniques that summarize, organize, and simplify data are
classified as ____________. - CORRECT ANSWER descriptive statistics
A researcher is interested in the average of time that 9th grade boys in the United
States spend playing video games. The entire group of 9th grade male students in
the U.S.A. is an example of a _________. - CORRECT ANSWER population
The major advantage of constructing a frequency polygon instead of a histogram
is that two or more distributions may be easily depicted on the same set of axes
when you use the polygon rather than bars. - CORRECT ANSWER True
In the frequency distribution where X refers to quiz scores (the number correct),
how many individuals took the quiz?
XF
,15 12
14 11
13 5
12 0
11 2 - CORRECT ANSWER 30
Rating a group of large metropolitan cities in the USA in terms of "quality of life"
using ratings of
1, 2, 3, 4, and 5, with "1" reflecting the lowest quality and "5" reflecting the
highest quality, would be an example of measurement on a(n) ____________
scale of measurement. - CORRECT ANSWER Ordinal
The ____________ is most useful for nominal data, whereas the median is more
useful with ____________ data. - CORRECT ANSWER Mode, Skewed
If the highest score in a distribution is X = 12 and the lowest score is X = 4, then
the range is 9 points. - CORRECT ANSWER True
The mean is considered to be the "midpoint" for a distribution because exactly
half of the scores are located above the mean and exactly half are below the
mean. - CORRECT ANSWER False
Since extreme values in a distribution do not affect the median, the __________ is
preferred with interval/ratio data when the data are extremely skewed. -
CORRECT ANSWER median
The standard deviation is closely related to the variance. In fact, the standard
deviation is the ____________ of the variance. - CORRECT ANSWER square root
A researcher measures personality for a sample of n = 50 people and classifies
each person as either Type A, Type B, or Type C personality. Which measure of
central tendency would be appropriate to summarize these measurements? -
CORRECT ANSWER mode
What value is obtained if you add all the deviations from the mean for a
population, then divide the sum by N? - CORRECT ANSWER You will always get
zero
, Which of the following is true for a normal distribution? - CORRECT ANSWER The
mean, median and mode are all equal
In general, what is the relationship between the standard deviation and variance?
- CORRECT ANSWER The standard deviation is the square root of the variance
A teacher gave a reading test to a class of 5th-grade students and computed the
mean, median, and mode for the test scores. Which of the following statements is
the only accurate description of the scores that can be made? - CORRECT
ANSWER Half of the students had scores equal to or above the median
The scores below are the heights, in inches, of number of grandchildren that
elderly adults in an assisted living home moved have.
Scores: 66, 68, 65, 67, 69, 66, 68, 68, 70, 65, 65
For these data, calculate the population variance, . Round to the nearest tenths
place if a fraction. The variance is: - CORRECT ANSWER 2.7
The scores below are the number of cups of coffee one Google employee drank
per day in a 7-day week.
The number of cups a Google employee
consumed per day for seven days: 5, 4, 8, 5, 9, 2, 4
For these data, calculate the standard deviation, ơ. Round to the nearest tenths
place if a fraction. The standard deviation is: - CORRECT ANSWER 2.2
The scores below are the numbers of dogs that nine "dog-loving" families have:
Dogs in the family: 5, 7, 8, 6, 4, 3, 2, 6, 5
For these data, calculate the mode. - CORRECT ANSWER 5&6
The scores below are the number of students who call in sick to a local
elementary school during flu season, each day for one week, beginning Monday
through Friday.
Questions with Verified Answers
Men's t-shirt sizes are classified as small, medium, large, extra large, and double
extra large. This is an example of measurement on a nominal scale. - CORRECT
ANSWER False
If a set of exam scores forms a negatively skewed distribution, it suggests that the
majority of the students scored well on the exam (where higher scores indicate
better performance). - CORRECT ANSWER True
The tools of descriptive statistics enable one to simplify, summarize, and organize
data. - CORRECT ANSWER True
After measuring a sample of individuals, a researcher finds that one participant's
score is bigger than another participant's score, but the researcher can't specify
how much bigger. The measurements must come from a(n) ____ scale. - CORRECT
ANSWER Ordinal
The class of statistical techniques that summarize, organize, and simplify data are
classified as ____________. - CORRECT ANSWER descriptive statistics
A researcher is interested in the average of time that 9th grade boys in the United
States spend playing video games. The entire group of 9th grade male students in
the U.S.A. is an example of a _________. - CORRECT ANSWER population
The major advantage of constructing a frequency polygon instead of a histogram
is that two or more distributions may be easily depicted on the same set of axes
when you use the polygon rather than bars. - CORRECT ANSWER True
In the frequency distribution where X refers to quiz scores (the number correct),
how many individuals took the quiz?
XF
,15 12
14 11
13 5
12 0
11 2 - CORRECT ANSWER 30
Rating a group of large metropolitan cities in the USA in terms of "quality of life"
using ratings of
1, 2, 3, 4, and 5, with "1" reflecting the lowest quality and "5" reflecting the
highest quality, would be an example of measurement on a(n) ____________
scale of measurement. - CORRECT ANSWER Ordinal
The ____________ is most useful for nominal data, whereas the median is more
useful with ____________ data. - CORRECT ANSWER Mode, Skewed
If the highest score in a distribution is X = 12 and the lowest score is X = 4, then
the range is 9 points. - CORRECT ANSWER True
The mean is considered to be the "midpoint" for a distribution because exactly
half of the scores are located above the mean and exactly half are below the
mean. - CORRECT ANSWER False
Since extreme values in a distribution do not affect the median, the __________ is
preferred with interval/ratio data when the data are extremely skewed. -
CORRECT ANSWER median
The standard deviation is closely related to the variance. In fact, the standard
deviation is the ____________ of the variance. - CORRECT ANSWER square root
A researcher measures personality for a sample of n = 50 people and classifies
each person as either Type A, Type B, or Type C personality. Which measure of
central tendency would be appropriate to summarize these measurements? -
CORRECT ANSWER mode
What value is obtained if you add all the deviations from the mean for a
population, then divide the sum by N? - CORRECT ANSWER You will always get
zero
, Which of the following is true for a normal distribution? - CORRECT ANSWER The
mean, median and mode are all equal
In general, what is the relationship between the standard deviation and variance?
- CORRECT ANSWER The standard deviation is the square root of the variance
A teacher gave a reading test to a class of 5th-grade students and computed the
mean, median, and mode for the test scores. Which of the following statements is
the only accurate description of the scores that can be made? - CORRECT
ANSWER Half of the students had scores equal to or above the median
The scores below are the heights, in inches, of number of grandchildren that
elderly adults in an assisted living home moved have.
Scores: 66, 68, 65, 67, 69, 66, 68, 68, 70, 65, 65
For these data, calculate the population variance, . Round to the nearest tenths
place if a fraction. The variance is: - CORRECT ANSWER 2.7
The scores below are the number of cups of coffee one Google employee drank
per day in a 7-day week.
The number of cups a Google employee
consumed per day for seven days: 5, 4, 8, 5, 9, 2, 4
For these data, calculate the standard deviation, ơ. Round to the nearest tenths
place if a fraction. The standard deviation is: - CORRECT ANSWER 2.2
The scores below are the numbers of dogs that nine "dog-loving" families have:
Dogs in the family: 5, 7, 8, 6, 4, 3, 2, 6, 5
For these data, calculate the mode. - CORRECT ANSWER 5&6
The scores below are the number of students who call in sick to a local
elementary school during flu season, each day for one week, beginning Monday
through Friday.
