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Introductory to Statistics

by: Angela Meador

Introductory to Statistics STA 215

Marketplace > Grand Valley State University > Statistics > STA 215 > Introductory to Statistics
Angela Meador

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About this Document

Important notes, steps and terms
Mary Luttenton
Class Notes
intro to statistics, Stats, Statistics, boxplot, Modified, IQR, Q1, Q3
25 ?




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This 2 page Class Notes was uploaded by Angela Meador on Sunday October 9, 2016. The Class Notes belongs to STA 215 at Grand Valley State University taught by Mary Luttenton in Summer 2015. Since its upload, it has received 3 views. For similar materials see Statistics in Statistics at Grand Valley State University.


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Date Created: 10/09/16
Descriptive Procedures Median­ middle value in data that is organized It is at least half of the data from the lower half and at least half of the data from the  upper half To find MD: n+1/2 Answer is odd: Should be a whole number Average between two numbers Answer is Even: Should end in .5 Average between two numbers Quartile 1= median of the lower half of the data At least 25% of the lower half At least 75% if the upper half 3= median of upper half of the data At least 75% of the lower half At least 25% of the upper half Finding the Quartiles INCLUDE THE MEDIAN IN BOTH HALFS Include the minimum and maximum numbers in the data along with Q1, Q3, and the median Boxplot Includes axis, box (Q1,Q3) whiskers­ minimum and maximum numbers in the whole data, and  the line inside the box= median Center­ Use median Spread­ Range (whiskers) IQR (Q3­Q1) Shape­ symmetric or skewed Modality Unimodal (One peak) Bimodal (More than one)  Cannot tell from the boxplot Improved Cap of the whiskers need to be 1.5 x IQR=X Q1 left whisker: Q1­ X Q3 right whisker: Q3 ­ X


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