By Michael Wood
ISBN-10: 1403901074
ISBN-13: 9781403901071
Making feel of Statistics offers an intensive, yet available, creation to stats and likelihood, with no the distractions of arithmetic. The ebook doesn't require you to exploit any algebraic formulae or equations, however it does clarify how and why equipment paintings, and precisely what solutions suggest. tips is equipped on the best way to layout investigations, examine info and interpret effects. There are routines and case stories from various parts of software, and an accompanying web site from which interactive spreadsheet versions and information documents will be downloaded.
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Extra info for Making sense of statistics : a non-mathematical approach
Example text
1. What is the probability that a bank robber is a rich man? And what about the probability that a rich man is a bank robber? For the first probability, the relevant bucket contains balls representing all the bank robbers in the sample. This bucket contains 11 balls representing 11 bank robbers. Ten of these 11 are rich, so the probability of a bank robber being a rich man is 10/11 or 91%. For the second probability, the relevant bucket contains balls representing all the rich men in the sample.
These included: How many units of alcohol did you drink last Saturday? There were similar questions for Sunday and Monday. A unit of alcohol is the amount in one glass of wine, or half a pint of beer. ) I also asked each student for their estimate of the average number of cigarettes they smoked each day. There were 92 students in the three groups. 1. xls. 1 seems to confirm a few stereotypes. 4, well above the 2 or 3 units a night implied by the government guidelines. 3 units: males seem to drink much more than females.
This is the standard deviation for the first bag. What is the standard deviation of the weight of apples in the second bag? 18 g, much larger than Bag 1, as we would expect. The sd is similar to the mean deviation from the mean. The only difference is the squaring, and then the square rooting to undo the squaring. Not surprisingly, the two answers tend to be similar: the sd is normally a bit bigger but how much bigger depends on the pattern of the numbers. You may wonder why we bother with the sd when the mean deviation from the mean seems similar, but more straightforward.
Making sense of statistics : a non-mathematical approach by Michael Wood
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