Statistics Lecture 3.pdf

# Statistics Lecture 3.pdf - Statistics Lecture 3 When are...

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Statistics Lecture 3

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When are they useful? Mean: When the average contribution over a period of time (or space) is required. average number of points scored by a basketballer average amount of wheat yield per hectare average annual superannuation return Median: Where outliers have undue effect house prices satisfaction surveys Mode: Where a single choice has to be made or data is nominal election results
Some examples: A class scores the following marks (/20) in a test 8 16 13 4 8 14 20 19 8 20 How would you say they have performed?

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Calculate the mean, median and mode of the following heartrates 58, 47, 52, 90, 90, 70 60, 45, 52, 154, 88, 72 Comment on the different answers provided by the different measures of central tendency.
Summary 3 different measures of central tendency: Mean (sum the values and divide by no. of values) use when average “contribution” is required Median (order the values and choose the middle) use where outliers bias answer or when values are ordered categories. Mode (commonest value(s))

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Types of Data GREG COLLINGS
What is Data? “facts and statistics collected together for reference or analysis”. (according to Google) Means different things to different fields.

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