Finite Chapter 8.3

Finite Chapter 8.3 - Math 120 SP08 SBrodnick 8.3: Measures...

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Math 120 SP08 SBrodnick 1 1 8.3 : Measures of Central Tendency 2 8.3: Measures of Central Tendency * 100 people chose a # between 1 and 40. Ten people were chosen at random to reveal their choices: 8, 27, 15, 2, 34, 15, 21, 11, 27, 15 * This is a sample because it’s only 10 of the 100 peoples’ numbers (usually used) * If we had all 100 numbers that the people had chosen, then we would have the data for the entire population 3 * We want a single measurement, or statistic from this set of numbers – there are a few… * Average , or mean In this case, we get the sample mean If we had all 100 numbers, we’d get the population mean μ (“mu”) * Median m middle value (if # of values is odd), or average of middle two values (if # of values is even) when values are arranged in ascending order * Mode value that appears most often x 8.3: Measures of Central Tendency 4 * In the calculator STAT, EDIT, enter values in L1 STAT, CALC, 1-var stats, ENTER On the list,
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Finite Chapter 8.3 - Math 120 SP08 SBrodnick 8.3: Measures...

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