Chapter 2

The sum of the deviations from or about the mean will always equal...

0

The mean score for physics test scores is 72, with a standard deviation of 4. Your score on the test is 80. How many standard deviations above the mean is your test score?

2

A sample of n=225 scores has XBar =103 and S^2=16. What is the sample standard deviation?

4

A measure that summarizes a distribution in terms of its centrality or typicality is: ________ .

A measure of central tendency.

The measure of dispersion that is based upon absolute values of deviations from the mean is the:

Average or mean deviation.

The ________ is found by calculating the sum of all of the scores in a distribution and then dividing the sum by the number of scores in the distribution.

Mean

µ is the symbol that represents the:

Standard deviation of a population.

Which of the following is NOT a measure of central tendency? A. The median B. The average deviation C. The mode D. The mean

The average deviation

Which of the following is NOT a measure of dispersion? A. The standard deviation B. The median C. The variance D. The mean deviation

The median

In order to obtain a more accurate reflection of the standard deviation or variance of the population, the standard deviation and variance for a sample are calculated by using ________ in the denominator of the formula, as opposed to using ________ in the formula.

n-1; n

One way to think about a Z score is to think of it as the:

ratio of the difference between a particular score and the mean of the distribution to the standard deviation of the distribution

The symbol used for standard deviation of a sample is:

s

The symbol used for the variance of a sample is:

s^2

The symbol used for standard deviation of a population is:

σ

The symbol used for the variance of a population is:

σ^2

What is the position of the median in the following distribution? {1, 4, 5, 7, 12, 14, 1, 13, 9, 10}

5. 5th score.

Assume you are working with population of N= 16 scores. The sum of all of the scores is equal to 96. What is the population mean?

6

What is the mode for the following distribution? {72, 83, 91, 72, 64, 93}

72

What is the value of the median in the following distribution? {1, 4, 5, 7, 12, 14, 1, 13, 9, 10}

8

A population of N=400 has µ=25 and σ=9. What is the population variance?

81

The range is...

A statement of the lowest and the highest score in the distribution.

The measure of central tendency that is sensitive to extreme scores is the:

Mean

XBar is the symbol that represents:

Mean of a sample

The score that is located in the middle of a distribution or the score that cuts a distribution in half is the:

Median

What is the relationship between the standard deviation and the variance?

The variance is equal to the standard deviation, squared.