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S5_Int2_Statistics

# S5_Int2_Statistics - 13 Feb 2012 13 Feb 2012 Created by Mr...

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Unformatted text preview: 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Quartiles from a Frequency Table Quartiles from a Cumulative Frequency Table Statistics Statistics www.mathsrevision.com Estimating Quartiles from C.F Graphs Standard Deviation Scatter Graphs Standard Deviation from a sample Probability Relative Frequency & Probability S5 Int2 13 Feb 2012 13 Feb 2012 Created by Mr Lafferty Maths Dept Created by Mr Lafferty Maths Dept Starter Questions Starter Questions 1. Calc ulat e t he m e an, m e d ian, m od e and r ange f or t h e we e kly wage s £ 2 0 0 , £ 10 0 , £ 8 0 0 £ 16 0 , £ 10 0 , £ 3 8 0 , £ 12 0 and £ 18 0 . 2 . Make a Cum ulat ive f r e que nc y t ab le f or a b at c h of e ggs gr ad e d in s ize s 1 - 7 . www.mathsrevision.com S5 Int2 13 Feb 2012 13 Feb 2012 Created by Mr Lafferty Maths Dept Created by Mr Lafferty Maths Dept Statistics Statistics Learning Intention Learning Intention Success Criteria Success Criteria 1. 1. Know the term quartiles. Know the term quartiles. 1. To explain how to calculate quartiles from frequency tables. 2. 2. Calculate quartiles given a frequency Calculate quartiles given a frequency table. table. www.mathsrevision.com Quartiles from Frequency Tables S5 Int2 Quartiles from Frequency Tables 13 Feb 2012 13 Feb 2012 Created by Mr Lafferty Maths Dept Created by Mr Lafferty Maths Dept Statistics Statistics www.mathsrevision.com Reminder ! S5 Int2 Range : The difference between highest and Lowest values. It is a measure of spread. Median : The middle value of a set of data. When they are two middle values the median is half way between them. Mode : The value that occurs the most in a set of data. Can be more than one value. Quartiles : The median splits into lists of equal length. The medians of these two lists are called quartiles. Quartiles from Frequency Tables 13 Feb 2012 13 Feb 2012 Created by Mr Lafferty Maths Dept Created by Mr Lafferty Maths Dept Statistics Statistics www.mathsrevision.com S5 Int2 To find the quartiles of an ordered list you consider its length. You need to find three numbers which break the list into four smaller list of equal length. Example 1 : For a list of 24 numbers, 24 ÷ 6 = 4 R0 6 number 6 number 6 number 6 number Q1 Q2 Q3 The quartiles fall in the gaps between Q 1 : the 6 th and 7 th numbers Q 2 : the 12 th and 13 th numbers Q 3 : the 18 th and 19 th numbers. Quartiles from Frequency Tables 13 Feb 2012 13 Feb 2012 Created by Mr Lafferty Maths Dept Created by Mr Lafferty Maths Dept Statistics Statistics www.mathsrevision.com S5 Int2 Example 2 : For a list of 25 numbers, 25 ÷ 4 = 6...
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S5_Int2_Statistics - 13 Feb 2012 13 Feb 2012 Created by Mr...

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