
	1.	For a set of data organized in a frequency distribution, the midpoint of each class interval is called a ______.
		A.	class interval	B.	class mark
		C.	class limit	D.	class range
		Hint

	2.	Find the value of x so that the mean of {3, 5, 7, 8, x} is 9.
		A.	21	B.	27
		C.	26	D.	22
		Hint

	3.	The second quartile point is also called the ______.
		A.	median	B.	range
		C.	mean	D.	mode
		Hint

	4.	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.	5.5-22.1	B.	9.6-18.0
		C.	26.3-34.7	D.	22.22-38.78
		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.	A 1% level of confidence is given when ______.
		A.	P = 95%	B.	P = 1%
		C.	P = 99%	D.	none of these
		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 99.91-195.89	B.	about 112.58-183.22
		C.	about 118.17-177.63	D.	about 101.41-194.39
		Hint

	8.	Find the class mark of 30–40 interval for the following data. 22, 35, 12, 37, 19, 36, 39, 13, 13, 36, 11, 37, 13, 38, 21, 37, 35, 29, 37
		A.	36	B.	38
		C.	35	D.	37
		Hint

	9.	Find the value of x so that the median of {4, 9, 6, 4, 4, 10, 5, x, 8, 9} is 6.5.
		A.	5	B.	8
		C.	6	D.	7
		Hint

	10.	Find the true statement related to the data below. 20, 15, 23, 14, 18, 12, 25, 10, 24, 12, 17
		A.	The data is more clustered between Q₂ and Q₃ than between Q₁ and Q₂.
		B.	The middle half of the data are between 17 and 25.
		C.	The semi-interquartile range is 5.
		D.	The data is more clustered between Q₁ and Q₂ than between Q₂ and Q₃.
		Hint