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Hypothesis testing for difference between two populations mean.

A sample of 40 observations is selected from one approximately normal population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The sample mean is 99 and the standard deviation is 6. Carry out a hypothesis test using the .04 level of significance to find out if there is a difference between the population means.

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