Thread: confidence level
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Old June 29th, 2009, 10:06 PM
chrissy72 chrissy72 is offline
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Default confidence level
A program was developed to increase memory and retention. 9 participants were scored before and after the program. Their paired results:

(80,85),(78,73),(80,86),(83,90),(93,95),(90,87),(7 9,75),(91,92),(95,98)

where the first number is the before average and the second number is the average following the program. At a confidence level of 95%, can we conclude that the program increases memory?

I'm stuck. Can I use the formula \bar{x}=+/-t_{\alpha/2}*\frac{s}{\sqrt{n}}? The two sets of data are confusing me. Thank you for helping.
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