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9 Cards in this Set

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a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval.

Histogram
used to graph distributions of numerical scores from an interval/ratio scale
Polygon
Similar to a histogram except that spaces are left between adjacent bars.
Bar Graph
Does not show absolute numbers
Relative Frequencies
symmetrical, with highest frequency in the middle and frequencies tapering off as you move toward either extreme
Normal Distribution
shows the probability associated with each value of X from x=0 to x=n. A nearly perfect normal distribution when pn & qn are both equal to or greater than 10.
Binominal Distribution
set of chi-square values for all of the possible random samples when null is true. Values are zero or larger. Typical chi-square distribution is positively skewed, critical region is placed in the extreme tail which reflects large chi-square values. df=c-1
Chi-Square Distribution
the exact shape of the F-distribution depends on the degrees of freedom for the two variables in the F-ratio with very large df values, nearly all of the F-ratios are clustered very near 1.00 with smaller df values. Distribution is more spread out. Variance is always positive.
F-Ratio Distribution
Approximates the shape of a normal distribution. Shape changes with degrees of freedom.

t-Distribution