SED 206 Chapter 3
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