Similarly, we will do the same with all the other results to get the following answers: Next we will subtract the above mean ”70.2” from each of the results. The heart rates (in beats per minute) of five men and five women are: 71, 83, 63, 70, 75, 69, 62, 75, 66, 68įind the variance and standard deviation of the results. The standard deviation is a measure of variability. ![]() We know our mean is 13 and population minus mean whole square gives us 280. Next we will draw a table to calculate population minus mean. Remember: In order to find the mean we add all the values together and divide it by the total number. N= the total number of x in the population It is never negative as it denoted by the symbol, thus every term is squared, so the answer is either zero or a positive number. Is a statistical measure that tells how measured data vary from the average value of the set of data. Measures of dispersion (quartiles, percentiles, ranges, variance and standard deviation) provide information on the spread of the data around the centre. Measures the fluctuation/variation that is present in the data.
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