1.	The set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71} represents the ages at death of the first 10 U.S. Presidents. Find the range of the data.
		A.	23	B.	18
		C.	13	D.	4
		Hint
	2.	For a set of data organized in a frequency distribution, the midpoint of each class interval is called a ______.
		A.	class limit	B.	class range
		C.	class interval	D.	class mark
		Hint
	3.	Find the mean of the set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}.
		A.	75.2	B.	76.9
		C.	77.4	D.	82.2
		Hint
	4.	In a stem-and-leaf plot, what could 8|1 represent?
		A.	81	B.	8100
		C.	all of these	D.	0.81
		Hint
	5.	What is the standard deviation for the data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}?
		A.	8	B.	about 7.56
		C.	about 7.17	D.	about 51.44
		Hint
	6.	The mean and standard deviation of a set of data are 30.5 and 13.8, respectively. Assume that the data are normally distributed. Name the interval about the mean in which about 68.3% of the data are located.
		A.	13.8 ± 1.0	B.	30.5 ± 6.9
		C.	30.5 ± 1.0	D.	30.5 ± 13.8
		Hint
	7.	Given the partial table below, identify the upper and lower limits of an interval about the mean within which 45% of the values of a set of data can be found if the mean is 30.5 and the standard deviation is 13.8. Assume the data are normally distributed.
		A.	22.22-38.78	B.	5.5-22.1
		C.	9.6-18.0	D.	26.3-34.7
		Hint
	8.	A 1% level of confidence is given when ______.
		A.	P = 95%	B.	P = 99%
		C.	P = 1%	D.	none of these
		Hint
	9.	From a population of 32 items, a sample of 25 items is chosen and found to have a standard deviation of 57.0. Find the standard error of the mean.
		A.	10.1	B.	11.4
		C.	7.25	D.	2.28
		Hint
	10.	Find the variance of the data below. 36, 49, 65, 77, 70, 49, 40, 58, 76, 73, 58, 39
		A.	202.58	B.	200.58
		C.	201.03	D.	199.61
		Hint