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269 1314 Testing a Hypothesis about Two Independent MeansHow can you test the null Hypothesis that two population means are equal, based on the results observed in two Independent samples? Why can t you use a one-sample t test? What assumptions are needed for the two- Independent -samples t test? Can you prove that the null Hypothesis is true? What is power, and why is it important?All flavors of social scientists are agonizing over the effects of Internetuse. One day you re told that e-mail helps you to connect to friends andfamily and makes you a happy, social person. Several days later the newsis bad.
Testing a Hypothesis about Two Independent Means 271 We’ll proceed with our analyses, assuming that the reported television times are correct. However, we will examine the impact of the outlying
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