ITIS 1P97 Study Guide - Midterm Guide: Skewness

• School: WLU
• Department: Information Technology Information Systems
• Course: ITIS 1P97
• Professor: Dipanjan Chatterjee

Document Summary

The standard normal distribution has mean of 0 and standard deviation of 1: skewness bias or tilt of the distribution to the left or right, negative skew occurs when more data is in the left tail then would be expected of the normal distribution and it has an elongated tail to the left(the hump is on the right0, positive skew occurs when more data is in the right tail then would be expected of the normal distribution and it has an elongated tail to the right(hump is on the left) Leptokurtic occurs when more data is concentrated closer to the mean then would be expected: kurtosis flatness or peakedness of distributions, mesokurtic normal, platykurtic occurs when less data is concentrated near the mean then would be expected t (or student"s t) distribution, continuous distribution, resembles normal distribution, used when standard deviation is unknown and sample is small.