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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Chapter 14
Confidence Intervals
In This Chapter
◆ Interpreting the meaning of a confidence interval
◆ Calculating the confidence interval for the mean with large and small samples
◆ Introducing the Student’s t-distribution
◆ Calculating the confidence interval for the proportion
◆ Determining sample sizes to attain a specific margin of error
Now that we have learned how to collect a random sample and how sample means and sample proportions behave under certain conditions, we are ready to put those samples to work using confidence intervals.
 
One of the most important roles that statistics plays in today’s world is to gather information from a sample and use that information to make a statement about the population from ...

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