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.