Choose the best answer

1.			In a frequency distribution the categories must
			A)	Be mutually exclusive.
			B)	Have at least 5 observations.
			C)	Be of the same size.
			D)	Be of nominal scale.
2.			To determine the class interval
			A)	Divide the class frequencies in half.
			B)	Divide the class frequency by the number of observations.
			C)	Find the difference between consecutive lower class limits.
			D)	Count the number of observations in the class.
3.			The class frequency is
			A)	The number of observations in each class.
			B)	The difference between consecutive lower class limits.
			C)	Always contains at least 5 observations.
			D)	Usually a multiple of the lower limit of the first class.
4.			A research organization is making a study of the selling price of home computers. There are 45 computers in the study. How many classes would you recommend?
			A)	10
			B)	20
			C)	6
			D)	3
5.			To find the class midpoint
			A)	Divide the class interval in half and add the result to the lower limit.
			B)	Find the difference between consecutive lower limits.
			C)	Count the number of observations in the class.
			D)	Divide the class frequency by the number of observations.
6.			Which of the following is not a guideline for a frequency distribution?
			A)	Avoid open-ended classes.
			B)	Have more than 5 but less than 15 classes.
			C)	Make the lower limit of the first class a multiple of the class interval.
			D)	Have more than 5 observations in each class.
7.			To convert a frequency distribution to a relative frequency distribution
			A)	Find the difference between consecutive lower class limits.
			B)	Divide the class frequency by the total number of observations.
			C)	Divide the lower limit of the first class by the class interval.
			D)	Multiple the class frequency by 100.
8.			In a line chart the horizontal axis:
			A)	Is usually in dollars.
			B)	Usually involves time, such as months or years.
			C)	Is usually shown with a dotted line.
			D)	Is usually reported as a percent.
9.			The difference between a histogram and a frequency polygon is
			A)	The frequency polygon is reported as a percent.
			B)	The histogram employs bars whereas the midpoints are connected for a frequency polygon.
			C)	Bars cannot be adjacent in a histogram.
			D)	Open-ended classes can be accommodated with a frequency polygon.
10.			In a cumulative frequency polygon
			A)	The class frequencies are converted to a percent.
			B)	There must be at least 5 observations in each class.
			C)	We add the class frequencies starting with the first class.
			D)	All of the above.
11.			For questions 11- 12 refer to the following information on the number of units assembled per shift at Acme Assembly, Inc. Units assembled Shifts 20 up to 30 16 30 up to 40 25 40 up to 50 51 50 up to 60 80 60 up to 70 20 70 up to 80 8 Total 200 The class interval is:
			A)	10
			B)	25
			C)	9
			D)	None of the above.
12.			For questions 11- 12 refer to the following information on the number of units assembled per shift at Acme Assembly, Inc. Units assembled Shifts 20 up to 30 16 30 up to 40 25 40 up to 50 51 50 up to 60 80 60 up to 70 20 70 up to 80 8 Total 200 The frequency for the third class is
			A)	200
			B)	51
			C)	10
			D)	None of the above.
13.			In a frequency table
			A)	the classes must be mutually exclusive.
			B)	the data is quantitative.
			C)	the should be at least 100 observations in the sample.
			D)	All of the above are correct.
14.			A pie chart is used when we wish to emphasize
			A)	The number of observations in each category.
			B)	The percent of observations in each category.
			C)	The level of measurement of the observations.
			D)	All of the above.