Children's Book Investigation

... Mode The mode= 3 letters per word as that has the most entries Range The range= the highest number of letters per word - the smallest number of letters per word. = 13-1 = 12 Median The median of 871 items is at the 436th no. (middle value), which is equal to 4 Mean= 4 letters per word Mode= 3 letters per word Range= 12 Median= 4 letters per word Standard Deviation Standard deviation= Mean = Mean = 3382 871 Mean = 4 No. of letters per word 2 2 1 -3 9 27 2 -2 4 8 3 -1 1 1 4 0 0 0 5 1 1 1 6 2 4 8 7 3 9 27 8 4 16 64 9 5 25 125 10 6 36 216 11 7 49 343 12 8 64 512 13 9 81 729 Total = 299 2061 Standard deviation = = = = 2.62 (2dp) = 3 This tells us that the number of letters per word in an adult's book will normally be within 3 of the mean. In other words the number of letters per word will usually be between 1 and 7. Childs book No. Of letters per word Total (Frequency) No. X frequency 1 53 53 2 72 144 3 89 267 4 71 284 5 58 290 6 37 222 7 26 182 8 21 168 9 3 27 10 1 10 Total= 441 1647 Mean Mean= 3rd row total 2nd row total Mean= 1647 441 Mean= 3.73 (2dp) Mean= 3 letters per word Mode Mode= 3

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