STAB22H3 Lecture 6: STAB22H3-Lecture 6
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STAB22H3 Full Course Notes
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5 the standard deviation as a ruler and the normal model. Review from last lecture: minimum, q1, median, q3, maximum, boxplot, a way to plot out the five number summary (min, q1, median, q3, and max, 3 ways of identifying skewedness based on boxplots: 67 on an exam with a mean of 50 and standard deviation of 10. For example the old number is 25 and the new number is 55. Z always have a mean of 0 and standard deviation of 1: by calculating a z-score is known as standardizing , gives a basis for comparison for things with different means and standard deviations, ex: 67 on an exam with a mean of 50 and standard deviation of. 62 on an exam with mean of 40 and standard deviation of 12. 62 (62-40) /12 = 1. 83: 62 is a slightly better performance regarding the mean and standard deviation.
