Statistics Quiz # 9

During the past year, Cindy and Bobby each read 2 books, but Greg read 25, Jan read 12, and Marcia read 9. The median number of books read by these individuals is ______.

2

9

10

50

Seven students reported the following individual earnings from their sale of books: $7, $13, $3, $5, $2, $9, and $3. In this distribution of individual earnings, the mean is ______ the mode and ______ the median.

Equal to; equal to

Greater than; equal to

Equal to; less than

Greater than; greater than

The ______ is calculated by summing all of the numbers in a distribution and dividing by the total number of scores.

Median

Mode

Mean

Average deviation

This measure of central tendency can be considered the least precise:

Median

Mode

Mean

Other

If a distribution is "significantly distorted" what is this called?

Variability

Outliers

Skew

Percentile

What is another way of describing "measures of central tendency"?

Statistical measure

Measure of variability

Averages

Deviation scores

This is calculated by multiplying values by the frequency of their occurrence, adding the total of all the products, and then dividing by the total number of occurrences:

Mean

Arithmetic mean

Mode

Weighted mean

A number that characterizes the “middleness” of an entire distribution is ______.

A measure of central tendency

A measure of variability

An inferential statistic

The standard deviation

What is another way of describing "measures of central tendency"?

Statistical measure

Measure of variability

Averages

Deviation scores

This is calculated by multiplying values by the frequency of their occurrence, adding the total of all the products, and then dividing by the total number of occurrences:

Mean

Arithmetic mean

Mode

Weighted mean

A number that characterizes the “middleness” of an entire distribution is ______.

A measure of central tendency

A measure of variability

An inferential statistic

The standard deviation

Which of the following measures scores differ from each other?

Skewness

Kurtosis

Average

Variability

Imagine that distribution A contains the following scores: 3, 4, 5, 6, 7. Imagine that distribution B contains the following scores: 1, 3, 5, 8, 10. Distribution A has a ______ standard deviation and a ______ average deviation in comparison to distribution B.

Larger; larger

Smaller; smaller

Larger; smaller

Smaller; larger

The calculation of the average deviation differs from the calculation of the standard deviation in that the difference scores are ______.

Squared

Converted to absolute values

Squared and converted to absolute values

Not different

The range is ______.

The arithmetic average

The middle score in a distribution after the scores have been ordered from highest to lowest or lowest to highest

The average difference between the scores in the distribution and the mean of the distribution

The difference between the lowest and highest scores in the distribution

The symbol s represents the standard deviation for ______.

A sample

The unbiased estimator of the population standard deviation

A population

None of these

The symbol S represents the standard deviation for ______.

A sample

The unbiased estimator of the population standard deviation

A population

None of these

The symbol σ represents the standard deviation for ______.

A sample

The unbiased estimator of the population standard deviation

A population

None of these

When we take the absolute value of the difference scores when calculating a measure of variability, we are using the ______.

Average deviation

Standard deviation

Range

Mean

Which of the following is not a measure of variability?

Mean

Standard deviation

Variance

Range

What is another term for variability?

Flux or variation

Scattergram

Skewness

Spread of dispersion

In order to calculate the variance, which of the following must you know?

Range

Range

Mean

Mode

When calculated on the same distribution of scores, the average deviation will be ______ the standard deviation.

Less than

Greater than

The same as

Either greater than or the same as

When we square the difference scores when calculating a measure of variability, we are using the ______.

Average deviation

Standard deviation

Range

Mean

What are the three tools used to assess variability?

Range, standard deviation, and variance

Mean, median, and mode

Variance, range, and mean

Mean, standard deviation, and skewness

The standard deviation is ______.

The arithmetic average

The middle score in a distribution after the scores have been ordered from highest to lowest or lowest to highest

The square root of the average squared deviation from the mean

The difference between the lowest and highest scores in the distribution

A distribution of test scores in your class that showed a very high number of students scored high, but a few students scored fairly low, would be ______.

Positively skewed

Negatively skewed

Not skewed

Normally distributed

A line graph of the frequencies of individual scores is called a ______.

Histogram

Frequency distribution

Frequency polygon

Bar graph

If you have a distribution of 50 scores and you want 5 intervals, what should be the size of the class interval?

50

25

10

5

If I collected data on the frequency of various weights for people in a weight loss program, what type of graph should I use to organize the data?

Histogram

Bar graph

Frequency polygon

Frequency distribution