Summary ISDS361A Exam #1 Cheat Sheet Latest
Update 2025/2026 Graded A+
a clerk entering salary data into a company spreadsheet accidentally put an
extra "0" in the boss's salary, listing it as $2,000,000 instead of $200,000. In the
following measures for the company payroll, which one won't be affected by
this error?
-the range
-the third quartile
-the standard deviation
-the mean
the third quartile
what is indicated by the vertical axis on a histogram?
a number of observations in each interval
which of the following is NOT a difference between bar charts and histograms?
-in a bar chart, there are gaps between the bars
-in a bar chart, sometimes the order in which you place the bars doesn't matter
-in a bar chart, it doesn't matter how wide or narrow the bars are as long as
they are consistent
-a bar chart is used for numerical variables while a histogram is used for
categorical variables
,a bar chart is used for numerical variables while a histogram is used for
categorical variables
indicate whether the data are time series or cross-sectional: average diameter
of trees brought to a sawmill in each week of year.
the data are time series because the data are measured over time
if the mean of a list of numbers is 200,000 and the median is 20,000, the shape
of the distribution is
unknown without further information
the_______ is a number that measures how far away the typical observation is
from the mean
standard deviation
"relative frequency" is the same as which of the following?
-proportion
-bin width
-frequency histogram
-distribution
proportion
what are data?
values with context
data warehouses
where data are recorded and stored electronically
, respondents
individuals who answer a survey
subjects or participants
people in an experiment
experimental units
animals, plants, websites, and other inanimate subjects
population contains
all units/items of interest and has unknown (or unknowable) parameters
samples is
a subset of a population. we use samples to form statistics, which we use to
estimate parameters
descriptive statistics or inference
to make inference means to estimate, predict, or generalize about a population
based upon information contained in a sample.
-data collected from a population and infer result from sample
a categorical or qualitative variable names
categories and answers questions about how cases fall into those categories
ex. gender, eye color, car brand
categorical variables used only to name categories that don't have order are
sometimes called
Update 2025/2026 Graded A+
a clerk entering salary data into a company spreadsheet accidentally put an
extra "0" in the boss's salary, listing it as $2,000,000 instead of $200,000. In the
following measures for the company payroll, which one won't be affected by
this error?
-the range
-the third quartile
-the standard deviation
-the mean
the third quartile
what is indicated by the vertical axis on a histogram?
a number of observations in each interval
which of the following is NOT a difference between bar charts and histograms?
-in a bar chart, there are gaps between the bars
-in a bar chart, sometimes the order in which you place the bars doesn't matter
-in a bar chart, it doesn't matter how wide or narrow the bars are as long as
they are consistent
-a bar chart is used for numerical variables while a histogram is used for
categorical variables
,a bar chart is used for numerical variables while a histogram is used for
categorical variables
indicate whether the data are time series or cross-sectional: average diameter
of trees brought to a sawmill in each week of year.
the data are time series because the data are measured over time
if the mean of a list of numbers is 200,000 and the median is 20,000, the shape
of the distribution is
unknown without further information
the_______ is a number that measures how far away the typical observation is
from the mean
standard deviation
"relative frequency" is the same as which of the following?
-proportion
-bin width
-frequency histogram
-distribution
proportion
what are data?
values with context
data warehouses
where data are recorded and stored electronically
, respondents
individuals who answer a survey
subjects or participants
people in an experiment
experimental units
animals, plants, websites, and other inanimate subjects
population contains
all units/items of interest and has unknown (or unknowable) parameters
samples is
a subset of a population. we use samples to form statistics, which we use to
estimate parameters
descriptive statistics or inference
to make inference means to estimate, predict, or generalize about a population
based upon information contained in a sample.
-data collected from a population and infer result from sample
a categorical or qualitative variable names
categories and answers questions about how cases fall into those categories
ex. gender, eye color, car brand
categorical variables used only to name categories that don't have order are
sometimes called
