环境数据分析课件 (15).pdf
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1、Chapter 5 The hypothesis testsWe are looking for the truth in data,with errors!The Hypothesis Tests Types of ErrorsCONTENTS Steps of Hypothesis Tests Related Statistics The Principle of small probabilityHypothesis Tests StepsStepsPropose the hypothesisH0 and H1Set the critical valueCalculate the sta
2、tistic Reach the decisionReject or accept H0 Null hypothesis H0Significance levelTest statisticp valueS1=S2,1=2TN=15.0 mg/LThe chance of incidence of every day is not as equal as 1/5.1=2S1S2,12TN15.0 mg/L1/51215.0 mg/L15.2 mg/LTN15.0 mg/L?TN=15.0 mg/L15.0 mg/L14.5-15.5 mg/L18.0 mg/LHypothesis test is process that we are testing the null hypothesis because there is an element of doubt about its validity.
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