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October 20, 2014

Homework Help: statistics

Posted by kesha on Friday, April 15, 2011 at 7:57pm.

A researcher is testing a null hypothesis that states: H: = 50. A sample of 25 scores is selected and the mean is M = 55.Assuming that the sample variance is s2 = 100, compute the estimated standard error and the t statistic. Is this sample sufficient to reject the null hypothesis using a two-tailed test with = .05? Assuming that the sample variance is s2 = 400, compute the estimated standard error and the t statistic. Is this sample sufficient to reject the null hypothesis using a two-tailed test with = .05? Explain how increasing variance affects the standard error and the likelihood of rejecting the null hypothesis.

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