1.	Use the set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}. If the data are grouped so that the lowest class interval is 65-70, how many classes are formed?
		A.	4	B.	5
		C.	6	D.	3
		Hint
	2.	For a set of data organized in a frequency distribution, the upper and lower values in each interval are called ______.
		A.	class intervals	B.	class limits
		C.	the class range	D.	class marks
		Hint
	3.	Construct a stem-and-leaf plot for the data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}.
		A.
		B.
		C.
		D.
		Hint
	4.	Find the semi-interquartile range of the data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}.
		A.	23	B.	6
		C.	12	D.	11.5
		Hint
	5.	Approximately what percent of the data is between 11 and 50 if the mean is 30.5 and the standard deviation is 13.8, given the partial table below? Assume the data are normally distributed.
		A.	83.8%	B.	68.3%
		C.	80.7%	D.	90.0%
		Hint
	6.	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.	7.25	B.	10.1
		C.	11.4	D.	2.28
		Hint
	7.	Use the partial table below. If = 57.0, N = 10, and = 147.9, find the interval about the sample mean that has a 5% level of confidence.
		A.	about 101.41-194.39	B.	about 99.91-195.89
		C.	about 118.17-177.63	D.	about 112.58-183.22
		Hint
	8.	Find the value of x so that the median of {4, 9, 6, 4, 4, 10, 5, x, 8, 9} is 6.5.
		A.	8	B.	5
		C.	6	D.	7
		Hint
	9.	Find the variance of the data below. 36, 49, 65, 77, 70, 49, 40, 58, 76, 73, 58, 39
		A.	200.58	B.	199.61
		C.	202.58	D.	201.03
		Hint
	10.	The mean of a set of normally distributed data is 65 and the standard deviation is 13. Find the value that defines the 75th percentile.
		A.	75	B.	75.8
		C.	74.1	D.	72.6
		Hint