STAT 100 Lecture Notes - Lecture 4: Box Plot, Histogram, Standard Deviation
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Mode most common not helpful. Mean add up and divide 30. 57. Put it in order then find halfway point. In between 7 and 8th position find value (25) Between 3rd and 4th position: 17. 90th: 90% of people scored same or less than you. At what value does at least 75% of the values equal or exceed. At what value does at most 75% of the values equal or exceed. What value and go down: q3 and down. 70-9=61: variance units are squared, standard deviation square route of variance, inner quartile range (iqr) Minimum value, q1, median, q3, maximum: 9, 17, 25, 42. 5, 70. Standard deviation square root of that 17. 4: average distance the observations are from the mean, roughly giving us the range from the middle 50% Find outliers by building a fence around our data. Lower fence: take 1st quartile and subtract 1. 5(iqr)
