Download e-book for kindle: A Primer of Statistics by Mary Phipps, Malcolm Quine

By Mary Phipps, Malcolm Quine

ISBN-10: 1740096266

ISBN-13: 9781740096263

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Moreover, the choices for data analysis are well organized Chapter 1: Beyond Number Crunching: The Art and Science of Data Analysis and listed in pull-down menus. Now almost anyone (even me) can quickly see how to find the necessary procedure and tell the computer what to do. The results come instantly and successfully, and you can cut and paste them into a word-processing document without blinking an eye. For example, comparing the weight loss for people on different weight-loss programs now takes less than three clicks of the mouse to perform, which is great news for folks like me.

According to the Simmons Research Bureau, 78 percent of adults reported eating chocolate, and of those, 18 percent admitted to eating sweets frequently. What’s missing in these results? These numbers are only a single sample of people, and those sample results are guaranteed to vary from sample to sample. You need some measure of how much you can expect those results to move if you were to repeat the study. This expected movement in your statistic is measured by the margin of error, which reflects a certain number of standard deviations of your statistic you add and subtract to have a certain confidence in your results (see Chapter 3 for more on margin of error).

741. This value says that coffees sold has a fairly strong negative relationship with the temperature of the football game. This makes sense, because on days when the temperature is low, people will get cold and want more coffee. On days when the temperature is higher, people will tend to drink less coffee and perhaps tend more toward soft drinks, which are cold. I discuss correlation further, as it applies to model building, in Chapter 4. Number of Coffees Sold versus Temperature 70000 60000 50000 Figure 1-5: Coffees sold at various air temperatures on football game day.

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A Primer of Statistics by Mary Phipps, Malcolm Quine

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