chap13 - InferentialStatistics SamplesandPopulations

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    Inferential Statistics
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    Samples and Populations Research findings are based on  samples drawn from populations Inferential statistics allow us to infer  what the population is like, based on  sample data
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    Two Group Means Ask samples of males and females  about their number of doctor visits  during the past year Suppose the mean for males is 1.3 and  the mean for females is 2.1
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    Do males and females differ? Is the mean number for males different  from the mean number for females? Obviously, the sample means are  different Can we infer that the population means  differ as well?
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    What’s the Problem? The difference observed in the samples  may be real However, the difference could just  reflect the fact that there is some  chance of error – there is always a  margin of error around the sample value
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    Statistical Significance Tests
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chap13 - InferentialStatistics SamplesandPopulations

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