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Stats. Test 1
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Gravity
Terms in this set (25)
Statistics come from ____ parameters come from _____
Samples, populations
Temperature is what scale of measurement
Interval
If you collect data on the entire population you have completed a ____
Census
If the N= 30 for this class and 26.7% of those are men, how many men are in the class
8
26.7 x 300 / 100
If ECU has 5,147 students and 2.114 are men what proportion of the students are women
0.59
Ex is read as
The sum of X
There should be between __ and __ groups when constructing a grouped frequency distribution
10 and 20 groups
When deciding on group size, you should use interval sizes of __
2,3,5 or multiples of 5
A vertical bar graph is known as a
Histogram
You post frequencies on the ___ axis and scores on the ___ axis
Y axis
X acis
The most important curve for inferential stats (and one often found in nature) is the ___
Normal or bell curve
The tail of a positively skewed distribution points to which side of the figure
Right side
Two terms that describe kurtosis are ___ and _____
Leptokurtic and platykurtic

X is also known as
Mean
The formula for the mean is
x = Ex
—
N
The ____ is the best central tendency to use when there are outliers are extreme scores
Median
In a positively skewed distribution, the order (smallest to largest) of the three central tendencies
Mode, median, mean
The ____ is the point around which the deviations sum to zero
Mean
Range is the ____. To find the range :____.
spread of numbers, subtract the smallest from the largest number.
What measure of variability is used when the median is reported
Interquartile range (IQR)
The definition of standard deviation is
How much, on an average, a score deviates from the mean
If the M= 28, and the S= 4, 68% of the scores lie between _ and _
284 = 24
28 + 4= 32
24&32
Exactly 95% of the cases lie within this many S.D units of the mean
1.96
If m = 37 and s = 9, distribution falls between
13.78 and 60.22
When should you use frequency polygons
Displaying cumulative frequency distributions
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