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Statistical Significance Hypothesis Testing When Comparing Two Means

Doing a Study That Tests a Hypothesis of Differences Between Means 146 Design of a Study That Compares Two Conditions 146 Applying the Logic of Hypothesis Testing 147 Reasoning From Reverse : The Logic of Testing the Null Hypothesis 149 Steps in Hypothesis Testing 150 Assumptions in Parametric Hypothesis Testing 153 Effects of Violating Parametric Assumptions 154 Testing the Assumptions 155 Testing for Normal Distributions 155 Testing for Homogeneous Variances Among Two or More Groups 157 Comparing Sample and Population Means 159 When the Population Standard Deviation Is Known 159 When the Population Standard Deviation Is Unknown 161 Using SPSS for the One-Sample t 163 Comparing the Means of Two Sample Groups: The Two-Sample t Test 164 Using t as a Sampling Distribution of Mean Differences 164 Conducting the Hypothesis Test for the Difference Between Two Sample Means 164 Using SPSS and Excel to Compute the Two-Sample t 167 SPSS ...

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