Suppose 100 randomly selected students at CCNY are given a standardized quiz.The test is scored from 0-100.After all students have taken the quiz,you tally up the scores and find that the average score is and the standard deviation is . What is the 95% confidence interval for the mean score of all CCNY students?

	a.	None of these
	b.	(53.45, 55.01)
	c.	(56.41, 59.59)
	d.	(56.67, 59.33)
	e.	(52.32, 54.67)

Suppose 100 randomly selected students at CCNY are given a standardized quiz. The test is scored from 0-100. After all students have taken the quiz, you tally up the scores and find that the average score is 58 and the sample standard deviation is 8. Suppose additionally, for comparison's sake, that you give the SAME standardized quiz to a group of 200 randomly selected students from Baruch College. Theiraverage score is 62 and the sample standard deviation is 11. What is the 90% confidence interval of the difference in means between CCNY and Baruch?

	a.	(-10.84, -3.22)
	b.	(-5.85, -2.15)
	c.	None of these.
	d.	(-4.58, -3.42)
	e.	(-3.43, -1.22)