Statistics Ch. 2

A curve with tails that decline more rapidly than the tails of a normal curve is called a heavy-tailed distribution. T or F

False

A data set consisting of many observations of a single characteristic is a categorical data set T or F

False

A data set is multivariate if it consists only of numeric variables. T or F

False

A pie chart is most useful for numeric data. T or F

False

For stem and leaf plots with single-digit leaves, commas must be used to separate the leaves. T or F

False

Frequency distributions can only be used with categorical data. T or F

False

If the upper tail of a distribution stretches out farther than the lower tail, the distribution is negatively skewed. T or F

False

In a scatter plot, both the horizontal and vertical axes must be set at zero. T or F

False

The density of a class can be calculated by multiplying the relative frequency of the class times the class width. T or F

False

The relative frequency for a particular category is the number of times the category appears in the data. T or F

False

A data set is discrete if the possible values are isolated points on the number line. T or F

True

An outlier is an unusually small or large data value. T or F

True

Bar charts should be used with categorical data. T or F

True

Dotplots work best for small and moderate sized numerical data sets T or F

True

One advantage of histograms is that they may be used for large data sets. T or F

True

The quantity (sq. root of number of observations) often gives a rough estimate of the appropriate number of intervals in a histogram

True