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In a two-tailed hypothesis test of the difference between two means based on independent random samples,...

In a two-tailed hypothesis test of the difference between two means based on independent random samples, the first sample had 30 observations with a mean of 40 and a standard deviation of 4. The second sample had 20 observations with a mean of 45 and a standard deviation of 5. Find the test statistic.

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Find out the test statistic for testing the differences of mean.

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