Statistical Methods

Why Statistics. ,[object Object],[object Object],[object Object]

The need for justification. ,[object Object],[object Object],[object Object],[object Object]

Question 1. ,[object Object],[object Object]

Question 2. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Mean, Mode, Median. ,[object Object],[object Object],[object Object],[object Object]

1- Mean ,[object Object],[object Object],[object Object],[object Object],[object Object]

Find the mean of these data values- ,[object Object],[object Object],[object Object],[object Object]

2- The Mode. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Find the mode of this data set. ,[object Object],[object Object]

Find the mode of this nominal data. Mode (Most frequently occurring category)= wheat. 17 Pasture 18 Barley 29 Wheat 3 Fruit 15 Vegetables 12 Rye 10 Clover Hectares Land Use

3- The Median. ,[object Object],[object Object],[object Object]

Find the median of this data set. ,[object Object],[object Object]

Now find the median of this data set. ,[object Object],[object Object]

Spread around the median and mean. ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],0 1993 3 1992 0 1991 0 1990 Rainfall (mm) Year 97 1994

Spread around the median: the interquartile range. ,[object Object],[object Object]

Method. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Over to you. ,[object Object],[object Object]

5 December 7 November 11 October 15 September 17 August 17 July 15 June 12 May 9 April 7 March 5 February 4 January Average temperature Month

Answer ,[object Object],[object Object],[object Object],[object Object],[object Object]

Spread about the mean: Standard deviation. ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Method.

[object Object],[object Object],[object Object],[object Object],[object Object]

82 10 75 9 42 8 63 7 70 6 60 5 92 4 80 3 75 2 50 1 Number of vehicles. Day

Answer. 6 724 82 5 625 75 1 764 42 3 969 63 4 900 70 3 600 60 8 464 92 6 400 80 5 625 75 2 500 50 x² x

Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Phew!!!!!! ,[object Object],[object Object]

Homework. ,[object Object],[object Object],[object Object]

Statistical Methods

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