SED 206 Chapter 3

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In a normal distribution with a mean of 50 and a standard deviation of 5, what percentage of scores fall between 45 and 55?

68

In a normal distribution with a mean of 90 and a standard deviation of 10, approximately what percentage of scores fall between 80 and 100?

68

In a normal distribution with a mean of 90 and a standard deviation of 10, what percentage of scores fall between 80 and 110?

81.5

A ________ expresses how often a score occurs in a set of data

Frequency distribution

Correlations range from _______:

+1.00 to -1.00

In a normal distribution with a mean of 50 and a standard deviation of 5, what percentage of scores fall between 55 and 60?

13.5

In a normal distribution with a mean of 90 and a standard deviation of 10, what percentage of scores fall between 100 and 110?

13.5

In a normal distribution with a mean of 50 and a standard deviation of 5, what percentage of scores fall between 55 and 65?

16

In a normal distribution with a mean of 90 and a standard deviation of 10, approximately what percentage of scores fall between 80 and 90?

34

Which of the following is the strongest correlation? a. +.50 b. -.85 c. +.71 d. -.34

B

Which of the following is the weakest correlation? a. +.50 b. -.85 c. +.71 d. -.34

D

The ______ the spread, the _______ the variance.

Greater/greater

A ________ scale is one in which equal differences in scores represent equal differences in amount of the property measured but with an arbitrary zero point.

Interval

The _______ is the mathematical average of the distribution of numbers.

Mean

The _______ is greatly affected by extreme scores.

Mean & Range

The _______ is the middle score in a distribution.

Median

The ______ is less affected by extreme scores than the ______.

Median/mean

The _______ is the number in the distribution that occurs most frequently

Mode

When setting up a frequency distribution it is very easy to calculate the _______ simply by inspection.

Mode

If in your distribution you have three or more modes, it is referred to as a

Multimodal distribution

A _________ correlation has an indirect relationship between the variables:

Negative

As X increases, Y decreases is an example of a ________ correlation.

Negative

In a ________ skewed distribution the majority of scores fall above the mean.

Negatively

Numbers on a football jersey are examples of _______ data.

Nominal

________ data is categorical data.

Nominal

First place, second place and third place finishes are examples of ________ data

Ordinal

_______ scales involve the rank order system.

Ordinal

As X increases, Y increases is an example of a ________ correlation

Positive

In a ________ skewed distribution the majority of scores fall below the mean

Positively

The ________ of a distribution is the difference between the high score and the low score in the distribution

Range

Distance, weight and duration are all examples of _________ data

Ratio

Correlations tell us the _________ between two variables.

Relationship

A _________ correlation has no relationship between the variables:

Zero

What are measures of central tendency:

a. Mean b. Median c. Mode

Correlations _______ indicate a cause and effect.

never

A _________ correlation has a direct relationship between the variables:

positive


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