Question 1.Which of the following statements about interpreting standard deviation is true?

1.Which of the following statements about interpreting standard deviation is true?

A.Neither Chebyshev’s Rule nor the Emprical Rule require any assumptions about the frequency distribution.

B.The Empirical Rule can’t be applied unless the frequency distribution is mound-shaped and symmetric. Chebyshev’s Rule can

be applied to any data set, regardless of the shape of its frequency distribution.

C.Neither the Empirical Rule nor Chebyshev’s Rule can be applied to data unless the frequency distribution is mound-shaped

and symmetrical.

D.Chebyshev’s Rule can’t be applied unless the frequency distribution is mound-shaped and symmetric. The Empirical Rule can

be applied to any data set, regardless of the shape of its frequency distribution.

2.Consider the following distribution:

Which of the following would you expect?

A.The mean is greater than the mode, which in turn is greater than the median.

B.The mean is greater than the median, and the median is greater than the mode.

C.There’s no difference in the values of the mean, median, and mode.

D.The mean is less than the median, and the median is less than the mode.

3.Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the medianof this data sample?

A.9.25

B.There’s no median value.

C.8

D.7

4.When obtaining data by _______ it’s mostimportant to inquire about the purposes of the original

experimenter.

A.conducting a survey

B.performing a designed experiment

C.collecting data observationally

D.reading a published source

5.Which of the following statements is trueabout a stem-and-leaf plot?

A.It separates data at the decimal point, creating horizontal rows whose values are close together.

B.It involves creating columns of dots, one for each datum in the sample.

C.Stem-and-leaf plots are histograms whose bars have been arranged in decreasing order of frequency.

D.It uses vertical bars to illustrate a probability distribution.

6.A study was conducted of the 12-month earnings per share for two categories of airline companies, with

the result shown in the chart below.

Based on the data, which of the following statements is correct?

Large

Airlines

Small

Airlines

$4.36 $1.60

6.19 –1.98

–0.42 1.03

3.73 –0.21

0.26 –1.15

6.27 4.19

0.59

1.52

1.97

4.57

0.05

A.The large airlines have a mean earnings per share of 3.40, and the small airlines have a standard deviation of 2.01.

B.The large airlines have a mean earnings per share of 3.40, and the small airlines have a mean earnings per share of 1.22.

C.The large airlines have a standard deviation of 2.88, and the small airlines have a standard deviation of 4.04.

D.The large airlines have a variance of 4.04, and the small airlines have a variance of 8.30.

7.When creating a histogram, it’s important to ensure that the classes of data satisfy which properties?

A.They must be mutually exclusive and exhaustive.

B.They must include each interval on the number line.

C.They must be all the same size.

D.No requirements are made; the individual creating the graph is free to choose any classes.

8.Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the meanof this data sample?

A.There’s no mean value.

B.9.25

C.7

D.8

9.Which of the following involves inferentialstatistics as opposed to descriptivestatistics?

A.A class of 50 statistics students earned an average grade of 73.5.

B.A local cable system, using a sample of 500 subscribers, estimates that 40 percent of its subscribers watch a premium channel

at least once per day.

C.The city business office reported 35 building permits for new single-family housing units.

D.The Alcohol, Tobacco and Firearms department reported that Houston had 1,791 registered gun dealers in 1997.

10.Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the standard deviation of this data sample?

A.243.5

B.5.90

C.34.79

D.4.31

11.If there are an odd number of data values in a set, the median will be the

A.value that appears the greatest number of times.

B.value that appears in the center.

C.average of all of the values divided by the number of values in the set.

D.average of the two end values.

12.Use the following data sample to answer the question.

4, 14, 6, 9, 21, 3, 7, 10

What is the varianceof this data sample?

A.4.31

B.34.79

C.5.90

D.243.5

13.Which of the following are parameters of a population?

A.?and?

B.?and n

C.?and x

D.?and?

14.To answer the question, refer to the following list of raw data.

63, 71, 72, 77, 77, 78, 86, 77, 88, 88

What is the modefor the data?

A.77.7

B.77

C.77.5

D.88

15.Which type of plot takes quantitative data and forms classes out of it, thus turning it into qualitative

data?

A.Dot plot

B.Histogram

C.Pie chart

D.Stem-and-leaf plot

16.What is the difference between a histogramand a bar chart?

A.The adjacent rectangles in a bar chart have a gap, while those for a histogram don’t.

B.A histogram and a bar chart both reflect qualitative data.

C.The adjacent rectangles in a histogram have a gap, while those for a bar chart don’t.

D.A histogram reflects qualitative data, while the bar chart represents quantitative data.

17.To answer the question, refer to the following list of raw data.

63, 71, 72, 77, 77, 78, 86, 77, 88, 88

What is the medianfor the data?

A.77

B.88

C.77.5

D.77.7

18.A particular sample contains 50 data values. According to Chebyshev’s theorem, which of the following

is the number of values you would expect to fall within 3.0 standard deviations of the mean?

A.35

B.45

C.25

D.5

19.To answer the question, refer to the following list of raw data.

63, 71, 72, 77, 77, 78, 86, 77, 88, 88

End of exam

What is the meanfor the data?

A.77.7

B.77

C.88

D.77.5

20.To answer the question, refer to the following data.

Ten students were sampled at random from a student population. Each was asked how many courses he or

she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2,

2, 3, 4, 5, 5, 5, 5, 6

What is the variancefor the data values?

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