Chapters 2.3-2.4, 3.1 - Chapters 2.3-2.4 3.1 Ch 2.3 to 2.4 I Types of Diagrams A Stem and Leaf 1 2 Take stem and slap a leaf on it i.e 1 | 0 = 10 3

Chapters 2.3-2.4, 3.1 - Chapters 2.3-2.4 3.1 Ch 2.3 to 2.4...

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Chapters 2.3-2.4, 3.1 8/27/2019 Ch 2.3 to 2.4 I. Types of Diagrams A. Stem and Leaf 1. 2. Take stem and slap a leaf on it, i.e. 1 | 0 = 10 3. Leaves can be decimals B. Scatterplot 1. 2. Helps determine if two variables are related a) Linear relationship : plots follow a trend sloping upward or downward b) Nonlinear relationship : x and y increase/decrease at different rates c) No relationship : No apparent relationship between the variables 3. The x-axis will usually represent time in statistics 4. Getting a scatter plot in TI-84 a) Stat > Edit > enter points in L1 and L2 > 2nd > y= > select scatterplot > zoom > 9 Side Notes - The limit of your class is up to you, usually computers will choose the higher number as the hard limit (i.e. class of 40-49 is 40<x<=49) - Histogram using relative frequency should look like the regular frequency one
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Unformatted text preview: -A left-skewed graph is considered a “negative skew” Ch 3.1 I. Measures of Central Location A. Mean 1. The average of data from the sample/population 2. Indicates the central tendency 3. Outliers can skew the data, meaning the mean can be shifted from the central tendency B. Weighted Mean 1. Used when some data points are more important than others 2. How to do it a) Decimilize the percentages b) Multiply (values)(the weighted percentage) c) Add up the products to get the final result C. Median 1. The data that lies in the middle of the sample/population 2. Data has to be sorted from lowest to highest 3. If there are two middle values, take their average and that will be your median D. Mode 1. The number occurring the most in that data set 2. Used for qualitative data...
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