You measure the lifetime of a random sample of 25 rats that

You measure the lifetime of a random sample of 25 rats that are exposed to 10 Sv of radiation (the equivalent of 1000 REM) for which the LD₁₀₀ is 14 days. The sample mean is $\"You$ = 13.8 days. Suppose that the lifetimes for this level of exposure follow a Normal distribution with unknown mean ? and standard deviation ? = 0.75 days.

Suppose you had measured the lifetimes of a random sample of 100 rats rather than 25. Which of the following statements is TRUE?

	A) The margin of error for our 95% confidence interval would decrease.
	B) The margin of error for our 95% confidence interval would increase.
	C) ? would decrease.
	D) The margin of error for our 95% confidence interval would stay the same since the level of confidence has not changed.

WITH 25

Z= 1.96

ERROR = 1.96* ( 0.75 / SRQT(25) ) = 0.294

WITH 100

ERROR = 1.96* ( 0.75 / SRQT(25) ) =0.147

SO AS YOU CAN SEE THE ERROR WITH SAMPLE 100 IS LESS THAN THE ERROR WITH SAMPLE 25

A) The margin of error for our 95% confidence interval would decrease.

You measure the lifetime of a random sample of 25 rats that are exposed to 10 Sv of radiation (the equivalent of 1000 REM) for which the LD100 is 14 days. The

You measure the lifetime of a random sample of 25 rats that

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