SOAN 2120 Lecture Notes - Lecture 7: Statistical Significance, Standard Score, Sorting
15 Oct 2017
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In a stem and leaf display, the value that comes before the decimal is the stem, and the value that comes after is the leaf. The stem and leaf display is like a key turned on its side. What are the three measures of relative standing: What is the total area under the normal distribution: Distribution curve: normal, bell curve, skewed- large data set. Each number is divided into two parts: before: stem, after: leaf, v: smallest on top, largest on bottom, h: smallest left, largest right. 99% +/- 2. 6 sd from mean: 95% of all observations will be within approximately +- 2 standard deviations of the mean, 99% of all observations will be within approximately +-2. 6 standard deviations of the mean. Z-score how many sd you are from mean. X= 10 2 3 7 8 9= 39 / 6 = 6. 5. X-x(bar)= 10-6. 5= 3. 5 / sd = 3. 5/3. 27 = 1. 07.
