Stat 226 T/F Book Questions Exam With
Complete Solutions
Zip codes are an example of numerical data. - answer False.
Zip codes are numbers, but you cannot perform sensible calculations with them.
Cases is another name for the columns in a data table. - answer False.
Cases is another name for the rows in a data table.
The frequency of a time series refers to the time spacing between rows of data. - answer
True
A Likert scale represents numerical data. - answer False.
A Likert scale is used for ordinal data.
Aggregation can convert cross-sectional data into a time series. - answer False.
Aggregation collapses a table into one with fewer rows.
Charts are better than frequency tables as summaries of the distribution of a
categorical variable. - answer True.
but for variables with few categories, a frequency table is often better
The frequency of a category is the dollar value of the observations in that group. -
answer False.
The frequency is the count of the items
Use a bar chart to show frequencies and a pie chart to show shares of a categorical
variable that is not ordinal. - answer True
Put the labels of the categories in order in a bar chart when showing the frequencies of
an ordinal variable - answer True
A Pareto chart put the modal category first. - answer True
The boxplot shows the mean plus or minus one standard deviation of the data. - answer
False.
The box is the median, with lower edge at the 25% point and upper edge at the 75%
point.
Wider bins produce a histogram with fewer modes than would be found in a histogram
Complete Solutions
Zip codes are an example of numerical data. - answer False.
Zip codes are numbers, but you cannot perform sensible calculations with them.
Cases is another name for the columns in a data table. - answer False.
Cases is another name for the rows in a data table.
The frequency of a time series refers to the time spacing between rows of data. - answer
True
A Likert scale represents numerical data. - answer False.
A Likert scale is used for ordinal data.
Aggregation can convert cross-sectional data into a time series. - answer False.
Aggregation collapses a table into one with fewer rows.
Charts are better than frequency tables as summaries of the distribution of a
categorical variable. - answer True.
but for variables with few categories, a frequency table is often better
The frequency of a category is the dollar value of the observations in that group. -
answer False.
The frequency is the count of the items
Use a bar chart to show frequencies and a pie chart to show shares of a categorical
variable that is not ordinal. - answer True
Put the labels of the categories in order in a bar chart when showing the frequencies of
an ordinal variable - answer True
A Pareto chart put the modal category first. - answer True
The boxplot shows the mean plus or minus one standard deviation of the data. - answer
False.
The box is the median, with lower edge at the 25% point and upper edge at the 75%
point.
Wider bins produce a histogram with fewer modes than would be found in a histogram
