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Things you should know for the first exam.
Types of variables: Categorical and Numerical(Quantitative)
Five number summary: Minimum, Lower Quartile, Median, Upper Quartile,
Maximum.
Range = Maximum – Minimum
IQR = Upper Quartile – Lower Quartile = Q3 – Q1
Sample mean: y =
(∑y)
n
(∑ ( y − y ) )
2
Sample standard deviation: s =
Standardized score: z =
n −1
y−y
s
Normal model:
68% between μ − 1σ and μ + 1σ
95% between μ − 2σ and μ + 2σ
99.7% between μ − 3σ and μ + 3σ
Use Table Z:
z=
y −μ
σ
y = μ + zσ
1