BUS711 Data: Description, Collection, and Sampling | Complete Solution

Exam: 250711RR - Data: Description, Collection, and Sampling

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Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.

1.    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 mean for the data?
A.    77
B. 77.7
C. 88
D. 77.5

2.    If there are an odd number of data values in a set, the median will be the
A.    value that appears in the center.
B.    average of the two end values.
C.    average of all of the values divided by the number of values in the set.
D.    value that appears the greatest number of times.

3.    Which type of plot takes quantitative data and forms classes out of it, thus turning it into qualitative data?
A.    Stem-and-leaf plot
B.    Pie chart
C.    Dot plot
D.    Histogram

4.    Which of the following statements about interpreting standard deviation is  true?
A.    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.
B.    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.
C.    Neither Chebyshev's Rule nor the Emprical Rule require any assumptions about the frequency distribution.
D.    Neither the Empirical Rule nor Chebyshev's Rule can be applied to data unless the frequency distribution is mound-shaped and symmetrical.

5.    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 variance for the data values?
A. 2.844
B. 1.6
C. 1.687
D. 2.56

6.    Which of the following statements is  true?
A.    When taking a sample from the population, the variable involved will always be qualitative.
B.    The definition of a census is the decennial census of the United States of America.
C.    In a true census, no inferential statistics can be done, because the entire population is the sample.
D.    A population is the object upon which we collect data.

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

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

What is the mean of this data sample?
A. 9.25
B.    8
C.    7
D.    There's no mean value.

 
8.    In a sample with mean x = 12 and standard deviation s = 3.5, a data point at 16.8 would have what sample z-score?
A. 1.37
B. 4.8
C. 1.4
D. We can't know the answer without knowing the population mean μ and standard deviation σ.

9.    A population is a collection of     about which we will measure certain  characteristics or properties, called     .
A.    people, traits
B.    data, numbers
C.    individuals, sample values
D.    experimental units, variables

10.    Given the data set 3, 6, 2, 9, –1, 0, compute ∑(x + 1)2.
A. 25 B. 137 C. 175
 
D. 625

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

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

What is the median of this data sample?
A.    There's no median value.
B.    7
C.    8
D. 9.25

12.    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 mean earnings per share of 1.22.
B.    The large airlines have a mean earnings per share of 3.40, and the small airlines have a standard deviation of 2.01.
C.    The large airlines have a variance of 4.04, and the small airlines have a variance of 8.30.
D.    The large airlines have a standard deviation of 2.88, and the small airlines have a standard deviation of 4.04.

13.    If a great many data values cluster to the left of a data distribution, which then tails off to the right, the distribution is referred to as
A.    leftward skewed.
B.    normal.
C.    rightward skewed.
D.    uniform.

14.    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.    There's no difference in the values of the mean, median, and mode.
C.    The mean is greater than the median, and the median is greater than the mode.
D.    The mean is less than the median, and the median is less than the mode.

15.    What is the difference between a histogram and a bar chart?
A.    A histogram and a bar chart both reflect qualitative data.
B.    The adjacent rectangles in a bar chart have a gap, while those for a histogram don't.
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.

16.    Consider the following chart:

Which of the measures of central tendency would best represent that data?
 
A.    Median
B.    Mean
C.    Mode
D.    Standard deviation

17.    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. 34.79
B. 243.5
C. 5.90
D. 4.31

18.    When obtaining data by     it's most important to inquire about the purposes of the original experimenter.
A.    reading a published source
B.    performing a designed experiment
C.    collecting data observationally
D.    conducting a survey

19.    Which of the following involves inferential statistics as opposed to descriptive   statistics?
A.    The Alcohol, Tobacco and Firearms department reported that Houston had 1,791 registered gun dealers in 1997.
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.    A class of 50 statistics students earned an average grade of 73.5.
D.    The city business office reported 35 building permits for new single-family housing units.

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

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

What is the range of this data sample?
A.    4
B.    6
C.    10
D.    18