Statistics & Data Analysis
Mean: Sum divided by count. Sensitive to outliers.
Median: Middle value when sorted. Resistant to outliers.
Mode: Most frequent value.
Range: Max minus min.
Standard deviation: Measures spread. You won't calculate it, but understand: adding a constant to all values doesn't change SD. Multiplying all values by a constant multiplies SD by that constant.
Normal distribution:
68% within 1 SD of mean
95% within 2 SD of mean
99.7% within 3 SD of mean
Percentiles: The 75th percentile means 75% of values fall below this point.
Median = 50th percentile.
Q1 = 25th percentile. Q3 = 75th percentile.
Interquartile range (IQR) = Q3 - Q1
GRE favorite: Data interpretation sets with bar charts, pie charts, and tables. Read axis labels carefully.
Reference:
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