Question

Post-exposure radiation levels are approximately Normally distributed with mean ? . The levels (in Sv) of a random sample of three trauma victims who were recently exposed are 5.5, 6.2, and 4.8. The margin of error for a 95% confidence interval for ? based on these data is

	A.	1.42.
	B.	1.29.
	C.	1.05.
	D.	1.74.

Answer 1

= 5.5

s = 0.7

At 95% confidence interval the critical value is t_{0.025, 2} = 4.303

Margin of error = t_{0.025, 2} * s/

                        = 4.303 * 0.7/

                        = 1.74

Option - D is correct.