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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]
Over to you. ,[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]

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Statistical Methods

  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11. 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
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20. 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
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26. 82 10 75 9 42 8 63 7 70 6 60 5 92 4 80 3 75 2 50 1 Number of vehicles. Day
  • 27. 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
  • 28.
  • 29.
  • 30.