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population means is to be...

The confidence interval for the difference between two population means is to be undertaken. For this purpose a random sample of size 18 is taken from Population-1. The sample mean is found to be 5.7. Population 1 variance is given as 9. Similarly a random sample of size 20 is taken from Population-2. The sample mean is found to be 6.3. Population 2 variance is given as 5. Assume that the populations are normally distributed. If we wish to use the %99 confidence level, then which of the following will NOT be correct?

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