Unit 2 Statistics
Which of the following is not a difference between bar charts and histograms?
A bar chart is used for numerical variables while a histogram is used for categorical variables.
A stemplot is often useful in which of the following cases?
When technology is not available and the data set is not large
In a histogram, observations are grouped into intervals called ____.
bins
The __ organizes data by recording all of the values observed in a sample, as well as how many times each value was observed.
distribution
A categorical variable is only called bimodal under what circumstances?
Two categories are nearly tied for most frequent outcomes.
When thinking about the variability of a categorical distribution, it is sometimes useful to think of the word _______.
diversity
What is the first step in almost every investigation of data?
make and appropriate graph
When describing the distribution of a categorical variable, the category that appears most often is called the _____.
mode
When summarizing graphs of categorical data, report the _______ and describe the _______.
mode and variability
"Relative frequency" is the same as
proportion
A distribution of a variable in which most of the values are relatively small but that also has a few very large values is called ________.
right skewed
What are Pareto charts?
Bar charts that are sorted from most frequent to least frequent
What two-step process is used to examine distributions?
See the data and summarize it
What are two commonly used graphs to display the distribution of a sample of categorical data?
Bar graph and pie chart
What is the most common trick to mislead readers of bar graphs?
Change the scale of the vertical axis so that it does not start at 0
When examining a distribution of numerical data, which of the following is not a feature that needs to be considered?
Each individual value
When examining the shape of a distribution of numerical data, which of the following is not one of the three basic characteristics of a distribution's shape?
How many numbers are in the data set.
All methods used for visualizing distributions are based on which of the following? Choose the correct answer below.
Make a mark that indicates how many times each value occurred in the data set.
Values so large or so small that they do not fit into the pattern of the distribution are called what?
Outliers
Because the human eye has a difficult time judging how much area is taken up by the wedge-shaped slice of a pie chart, which of the following is true of pie charts?
Pie charts are not commonly used by statisticians or in scientific settings.