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are used everyday in life, and are very important in the everyday world. One important use of is to summarize a collection of data in a clear and understandable way. For example, if a psychologist gave a personality test measuring shyness to all 2500 students at ....

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.... about a population from a sample. An example is, if ten people who performed a task after twenty-four hours without sleep scored 12 points lower than ten people who performed after a normal night's sleep. Is the difference real or could it be due to chance? How much larger could the real difference be than the 12 points? These are the types of questions answered by inferential statistics. There are two main methods used in inferential statistics: estimation and hypothesis testing. In estimation, the sample is used to estimate a parameter and a confidence interval about the estimate is constructed. In the most common use of hypothesis t ....