data handling
...cting every 5th boy and every 5th girl, this will give me an even spread of data to work with. Problems that may occur Some problems may occur when using the secondary data. Some erroneous results may arise as the result of pupils giving false data, some data may even be the product of a typing error. If such results arise then the data will be disregarded and the next result taken. Results This results table for the boys will enable me to acquire results for the mean, median and range. Boys IQ Mid Point (x) Freq (f) Mid Point X Freq (fx) 80-90 85 6 510 90-100 95 6 570 100-110 105 3 315 110-120 115 7 805 120-130 125 1 128 23 2328 Mean = Freq (f) total Freq X Mid Point (fx) total = .fx. = 2328 = 101.2173913 f 23 Range = difference between 80-130 = 50 Girls IQ Mid Point (x) Freq (f) Freq X Mid Point (fx) 80-90 85 2 170 90-100 95 11 1045 100-110 105 16 1680 110-120 115 3 345 120-130 125 0 0 32 3240 Mean = Freq (f) total Freq X Mid Point (fx) total = .fx. = 3240 = 101.25 f 32 Range = difference between 80-130 = 50 Cum...