Understanding Biostatistics (Statistics in Practice) 
Understanding Biostatistics looks at the fundamentals of  biostatistics, using elementary statistics and explores the nature of  statistical tests, the tests that produces the p-values and basic  aspects of clinical trials.
The concept of distribution functions are discussed, including the  Guassian distribution and its importance in biostatistics. The book also  looks at problems of estimating parameters in statistical models and  looks at the similarities between different models. The author does not  set out to provide the definitive text on biostatistics, but rather to  provide a guide to the concepts involved and their application in  everyday work.
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