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A sample of 225 elements from a population with a standard deviation of 75 is selected. The sample mean is 180. The 98% confidence interval

A sample of 225 elements from a population with a standard deviation of 75 is selected. The sample mean is 180. The 98% confidence interval foris

	a.	175 to 185.
	b.	165.6 to 194.4.
	c.	164.575 to 195.425.
	d.	105 to 225.

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