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2. From a normal population, a sample of 245 observations is selected. The population standard deviation...

2. From a normal population, a sample of 245 observations is selected. The population standard deviation is 28, and the sample mean is 17.

a.

Determine the standard error of the mean. (Round your answer to 3 decimal places.)

STANDART ERROR OF THE MEAN: …..?

b.

Determine the 95% confidence interval for the population mean. (In your calculations: round your z/t value to 2 decimals, but round all other values to 3 decimals. Round your final answer to 3 decimal places.)

CONFIDENCE INTERVAL ….............. AND …........... ?

Math   Statistics-And-Probability   
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