Download e-book for kindle: Interpreting Data: A First Course in Statistics by A J B Anderson

By A J B Anderson

ISBN-10: 0412295601

ISBN-13: 9780412295607

ISBN-10: 1489931929

ISBN-13: 9781489931924

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Br. Med. ) 10. B. K. Chesterton, Williams (1939) counted the numbers of words in 600 sentences sampled from a major work of each. 14. (a) For G BS, the first 15 sentences in each of the first 40 sections of the work were chosen (though the frequencies add to only 598). For GKC, the first 30 sentences were counted in each of the first 20 chapters. Are you happy with such a sampling scheme? Suggest a better method. (b) Draw histograms for the two distributions of sentence length, giving particular thought to sensible class widths.

Considerations ofthis kind are looked at again in Chapter 5. g. g. IQs of husband and wife). In such a situation (called a paired comparison study), the corree:t analysis is to derive a new variable from the difference between the two under consideration; naturally, the mean of this new variable equals the difference between the means of the two original variables and its standard error is the correl~t one to use. For instance, we could make a paired comparison of two different brands of petrol by running each of the original 25 cars on a gallon of the second fuel.

8(d) is negatively skewed. Usually it is the tails of distributions that are of greatest interest since they tell us about the proportion of values that exceed (right-hand tail) or are exceeded by (left-hand tail) any specified figure. Naturally, population analogues of the ogive and survivor plot are relevant to this. Remember, the above are only examples. For instance, there are a number of bell-shaped symmetric distributions other than the normal and they cannot readily be differentiated by eye.

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Interpreting Data: A First Course in Statistics by A J B Anderson

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