Data observation and Descriptive Statistics. Organizing Data. Frequency distribution Table that contains all the scores along with the frequency (or number of times) the score occurs. Relative frequency: proportion of the total observations included in each score. . Frequency distribution.
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Which college has more variation?
The first step in calculating standard deviation
Sum of deviations = 0
NSample Standard Deviation
s = ∑( X - X ) ²
N - 1
Unbiased Sample estimator
Population standard deviation
Memory hint: skew is where the tail is; also the tail looks like a skewer and it points to the skew (either positive or negative direction)
Skewness, Number of Modes, and Kurtosis in Distribution of Housing Prices
z = (X - µ)
Sample z-score: z = (X - M)
M = 70
s = 10
The percentage of scores that your score is higher than.
he is smarter than 4% of the population (or 96% of the population is smarter than Homer).