Question 205670
Shipments of meat, meat by-products, and other ingredients are mixed together in several filling lines at a pet food canning factory. After the ingredients are thoroughly mixed, the pet food is placed in eight-ounce cans. Descriptive statistics concerning fill weights from the two production lines, from two independent samples are given in the following table. 
Line A Line B
X 8.005 7.99
S 0.012 0.005
N 11 16 
Assuming the population variances are equal, at the 0.05 level of significance, is there evidence of the difference between the mean weigh of the cans filled on the two lines?

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Since the variances are equal, pool the variances. 
I ran a 2-Sample t-test on a TI calculator and got
the following:
test statistic: t = 4.4967
p-value: 0.000138
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Conclusion: This test provides evidence that there
is a difference between the mean weights of cans
produced by the two lines.
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Cheers,
Stan H.