A sample of 400 items is taken from a population whose standard deviat

1.	A sample of 400 items is taken from a population whose standard deviation is 10. The mean of sample is 40. Test whether the sample has come from a population with mean 38. Also calculate 95% confidence interval for the population.
Answer» ANSWER: sample of 400 items is taken from a population WHOSE standard deviation is 10. The mean of sample is 40. Test WHETHER the sample has come from a population with mean 38. Also CALCULATE 95% confidence interval for the population.

A sample of 400 items is taken from a population whose standard deviation is 10. The mean of sample is 40. Test whether the sample has come from a population with mean 38. Also calculate 95% confidence interval for the population.

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sample of 400 items is taken from a population WHOSE standard deviation is 10. The mean of sample is 40. Test WHETHER the sample has come from a population with mean 38. Also CALCULATE 95% confidence interval for the population.

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A sample of 400 items is taken from a population whose standard deviation is 10. The mean of sample is 40. Test whether the sample has come from a population with mean 38. Also calculate 95% confidence interval for the population.

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