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December 22, 2014

December 22, 2014

Posted by **Jerry** on Saturday, July 18, 2009 at 11:57am.

The experimental group has a mean of 38 on the test(with an estimated population standard deviation of 3): the control group has a mean of 35 ( with an estimated population standard deviation of 5) Using the .05 level, what should the experimenter conclude?

(a)Use the steps of hypothesis testing,

(b) sketch the distributions involved

(c) explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.

- sattistics -
**Mrs. Nation**, Friday, November 30, 2012 at 7:24pm(a) and (c)

Ho: u(ex) - u(ct) = 0

Ha:u(ex) – u(ct) is not equal to 0

Test stat: t = (38-35) / sqrt[9/20 + 25/30] = 2.6482

p-value = 2*P(t > 2.6482 with df = 48) = 0.0109

Conclusion:

At the 5% significance level, reject Ho because the p-value is less than 5%

I need part b any suggestions?

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