Descriptive Statistics Exam
Questions and Answers Verified
Solutions Latest Update
(2026/2027)
Question:
Descriptive statistics or summary statistics
Answer:
Question:
Quantities that capture important features
of a frequency distribution, like location and spread for numerical data, and
proportion for categorical
data.
proportion
Answer:
Question:
measures the fraction of observations in a given category
location and spread
Answer:
, Question:
The location informs us about the average or typical individual in a
frequency distribution - where observations are centered. The spread
delineates how variable the
measurements are from the center.
sample mean
Answer:
Question:
The average of measurements in a sample, or the sum of all the
observations divided by the number of observations.
standard deviation
Answer:
A measure of the spread of a distribution from the mean,
calculated as the square root of the variance.
Question:
For normal or bell shaped frequency distributions the standard deviation has
a straightforward
interpretation.
Answer:
About two-thirds of the observations will fall within one standard
deviation of the mean, and about 95% will fall within two standard deviations
from the mean.
Questions and Answers Verified
Solutions Latest Update
(2026/2027)
Question:
Descriptive statistics or summary statistics
Answer:
Question:
Quantities that capture important features
of a frequency distribution, like location and spread for numerical data, and
proportion for categorical
data.
proportion
Answer:
Question:
measures the fraction of observations in a given category
location and spread
Answer:
, Question:
The location informs us about the average or typical individual in a
frequency distribution - where observations are centered. The spread
delineates how variable the
measurements are from the center.
sample mean
Answer:
Question:
The average of measurements in a sample, or the sum of all the
observations divided by the number of observations.
standard deviation
Answer:
A measure of the spread of a distribution from the mean,
calculated as the square root of the variance.
Question:
For normal or bell shaped frequency distributions the standard deviation has
a straightforward
interpretation.
Answer:
About two-thirds of the observations will fall within one standard
deviation of the mean, and about 95% will fall within two standard deviations
from the mean.
