Describe independent populations where the variances, Operation Management

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In order to test the difference in population's means, samples were collected for two independent populations where the variances are assumed equal and the population normally distributed. The following data resulted:
population 1 population 2
xbar=112 xbar=107
s=14 s=17
n=25 n=28
The value of the pooled standard deviation is 15.66.
true or false? why?

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