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Formulas for Exam 1
Summary Statistics
five number summary: minimum, Q1 , median, Q3 , maximum
InterQuartile Range: IQR = Q3 − Q1
Range = maximum − minimum
Y =
s=
(ΣY )
n
vn
u
u Σ(Y
u
t
− Y )2
(n − 1)
o
n
Σ(X − X)(Y − Y )
r=
(n − 1)sX sY
o
Standarization:
X follows a normal distribution
with mean µ and standard deviation, σ
z=
(X − µ)
σ
X = µ + zσ
1
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