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July 24, 2014

July 24, 2014

Posted by **emily** on Sunday, April 29, 2012 at 2:40pm.

Use an 80% confidence interval to test the null hypothesis that the mean start up cost is 118. Justify answer.

- statistics -
**PsyDAG**, Monday, April 30, 2012 at 2:38pm80% = mean ± 1.28 SEm

SEm = SD/√n

Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

I'll let you do the calculations.

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