Download Histogram Shapes Scatterplot Associations Symmetric Strong

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Histogram Shapes
Scatterplot Associations
Symmetric
Strong/Moderate/Weak
Uniform
Positive/Negative
Skewed
No Association
Single Peaked
Linear/Non-linear/Linear with Clusters
Double Peaked
Formulas
Measures of Spread
Inner Quartile Range (IQR) = Q3 - Q1
Measures of Center
Mean = Σx / n
Range = Max - Min
Mean Absolute Deviation = Σ(x - x) / n
Circle Graphs
angle/360 = percent/100
Z-score = (x - x) / σ
# in category = population x category percent
Probability
P(event) = # outcomes in event/# items in sample space
Conditional Probability: P(A | B) = P(A and B) / P(B)
Additional Rule: P(A or B) = P(A) + P(B) - P(A and B)
If P(A) = P(A | B) OR if P(A and B) = P(A) x P(B), then A and B are independent
If P(A) + P(B) = 1 then A and B are complement events
If P(A and B) = 0 then A and B are mutually exclusive
Symbols
Σx = sum of all values in a list
σx = population standard deviation
Sx = sample standard deviation
Q1 = 1st Quartile
μ = population mean
Q3 = 3rd Quartile
x = sample mean
r2 = Correlation Coefficient
n = number of entries in a list
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