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An experimenter wants to conduct a hypothesis test on a claim that there was no difference between two population means. That is, H0: ?1 - ?2 = 0. Which of the following 95% confidence intervals on the difference, ?1 - ?2, would lead to rejection of the null hypothesis at the 5% level of significance?
A. (-14.2, 28.7)
B. (-2.4, 20.5)
C. (3.5, 5.6)
D. None of the above
A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
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the mean and standard deviation of the lifetime of a battery in a portable computer are 3.5 and 1.0 hours
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