Lecture2__8211_Chapter1

# Lecture2__8211_Chapter1 - Lecture 2 Chapter 1 Wednesday...

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Lecture 2 – Chapter 1 Wednesday, August 27 th

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Stem-and-Leaf Diagram ± Steps: ² Select the stem values ² List stem values in a vertical column ² Record the leaf for every observation next to the corresponding stem value ² Write the key
Example ± I ask 20 professors in the statistics department to tell me their age. The answers I got were: 45, 66, 70, 32, 36, 78, 85, 39, 32, 43, 48, 53, 57, 42, 59, 50, 68, 63, 52, 43 ± Construct a stem-and-leaf diagram

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Histogram ± There are two types of histograms: ² Frequency histograms ² Relative frequency histograms. ± The two histograms have no differences if you use them for display purposes. If you want to make comparisons between two populations or two variables id better to use the relative frequency histogram.
Definitions ± Frequency is the number of times each value occurs (or the number of times values in an interval occurs) ± Relative frequency is the proportion of times one value occurs (or the proportion of times values in one interval occurs)

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Example ± I ask 20 professors in the statistics

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Lecture2__8211_Chapter1 - Lecture 2 Chapter 1 Wednesday...

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