A sample of 225 elements from a population with a standard deviation of 75 is selected.The sample mean is 180.The 95% confidence interval for μ is
A) 105 to 225.
B) 175 to 185.
C) 171.78 to 188.22.
D) 170.2 to 189.8.

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The Answer of A sample of 225 elements from a population with a standard deviation of 75 is selected.The sample mean is 180.The 95% confidence interval for μ is
A) 105 to 225.
B) 175 to 185.
C) 171.78 to 188.22.
D) 170.2 to 189.8.

A Sample of 225 Elements from a Population with a Standard