Stats Chapter 1-4

A dot plot is best applied when _____________________.

A single variable is summarized

The interquartile range is graphically presented in a ___________.

Dot plot

For a relative frequency distribution, relative frequency is computed as _____________.

Frequency Class divided by the total Frequency

The sum of the deviations of each data value from this __________ will always be zero.

Mean

For a data set, half of the observations are always greater than the ____.

Median

What is an example of a continuous variable?

Tons of concrete to complete a parking garage

T/F. In a bar chart, the x-axis is labeled with the values of a qualitative variable.

True

T/F. The principal difference between the interval and ratio scale is that the ratio scale has a meaningful zero point.

True

The higher the standard deviation is to the mean......

the more dispersion the data is

what is the symbol of population

the weird u

A relationship between two nominal variables is summarized by a contingency table.

A contingency table

What is the possible range of values for Pearson's coefficient of skewness?

-3 and +3

T/F. A store asks shoppers for their zip code to identify market areas. Zip codes are an example of ratio data.

False

T/F. For any distribution, there are an equal number of values above and below the mean

False

A dot plot shows ____________.

The general shape of a distribution

What statistics are needed to draw a box plot?

The minimum, maximum, median, first and third quartiles.

Data measured on a nominal scale can only be classified into categories.

True

T/F A population is a collection of all individuals, objects, or measurements of interest.

True

T/F To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the sum of the class frequencies.

True

T/F. A class interval, or class width, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.

True

T/F. A dot plot is useful for quickly graphing frequencies in a small data set.

True

T/F. A pie chart shows the relative frequency in each class

True

T/F. For any data set, Chebyshev's theorem estimates the proportion of observations that occurs within k standard deviations of the mean, where k is greater than 1.0.

True

In order to convert class frequency to relative class frequency,

divide the frequency by the sample size

T/F Descriptive statistics are used to find out something about a population based on a sample.

false

A portion or part of a population is called a:

sample