When data is collected using a qualitative, nominal variable, what is true about a frequency distribution that summarizes the data?
A) Lower and upper class limits can be computed.
B) Class midpoints can be computed.
C) Number of classes corresponds to number of the variable's categories.
D) None of the above
Q. 2The standard deviation of the sample data 13, 14, 17, and 20 equals:
A) 2.74
B) 3.16
C) 7.98
D) 9.16
Q. 3A professor needs to select a volunteer for a project. Which of the following would not be an example of a simple random sample?
A) He chooses a number between 00 and 99. The student whose phone number has the last two digits closest to the one the professor has chosen is selected.
B) He chooses that individual whose name is first in alphabetical order.
C) He puts all student names in a bowl, mixes them up, and selects one.
D) He has each student select a number between 0 and 99 and write it down. He then selects the student whose number is closest to the last two digits of his social security number.
Q. 4________ probability is the number of events in the population that meet the condition divided by the total number in the population.
A) Objective
B) Classical
C) Relative frequency
D) Subjective
Q. 5The proportion of times that an event will occur, assuming that all outcomes in a sample space are equally likely to occur, is called:
A) objective probability.
B) classical probability.
C) relative frequency probability.
D) subjective probability.
Q. 6Which of the following statements is true?
A) Measures of variability are numbers that describe the scatter of the data or the extent to which the data values are spread out.
B) The range is the most useful measure of variability.
C) The weighted mean is the most useful measure of variability.
D) All of the above
Q. 7Of the customers who rated their detergent good, what percentage evaluated Brand C?
A) 23.6
B) 34.0
C) 8.0
D) 28.8
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