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Statistics Lectures - 6 (Skewness, Normal Distribution, Empirical Rule)

A series of free Statistics Lectures with examples & solutions in videos.

These lectures cover skewness, normal distribution and the empirical rule.




 
This is the sixth page of the series of free video lessons, "Statistics Lectures".

Statistics - Lecture 16

Skewness - describes how the distribution of data "leans" away from a normal curve.
A symmetrical distribution has no skew. The mean exists perfectly at the center.
If a distribution is skewed to the right. The mean is pulled to the left from the center.
If a distribution is skewed to the left. The mean is pulled to the right from the center.
Skewness is important to recognize because it has implications in hypothesis testing.



Statistics - Lecture 17

The Normal Curve and Empirical Rule
The Normal Curve or normal distribution describes a bell-shaped symmetrical distribution of data.
The distribution of most continuous random variables will follow the shape of the normal curve.
Mean, Median, and Mode all exists at the center.
The graph changes direction at the inflection point.
The Empirical Rule states that:
65% of all values fall within 1 standard deviation of the mean.
95% of all values fall within 2 standard deviations from the mean.
99.7% of all values fall within 3 standard deviations from the mean.

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