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January 31, 2015

January 31, 2015

Posted by **jessika** on Friday, September 24, 2010 at 10:46am.

Machine I 23 26 19 24 26 22 20 18

Machine II 21 24 23 25 24 25 24 23

Test at the 5% significance level if the mean time taken to assemble a unit of the product is different for the two types of machines.

- statistics -
**PsyDAG**, Friday, September 24, 2010 at 12:03pmCalculate the mean and standard deviation for each machine.

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

- statistic -
**jessika**, Friday, September 24, 2010 at 12:21pmHypothesis Test: Independent Groups (z-test)

Machine I Machine II

22.25 23.63 mean

3.06 1.30 std. dev.

8 8 n

-1.375 difference (Machine I - Machine II)

1.175 standard error of difference

0 hypothesized difference

-1.17 z

.2421 p-value (two-tailed)

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