Question:1. 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 the two end values.
D. average of all of the values divided by the number of values in the set.
Question:2. 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 standard deviation for the data values?
A. 1.44
B. 2.84
C. 1.687
D. 2.56
Question: 3. Which of the following statements is true?
A. In a true census, no inferential statistics can be done, because the entire population is the sample.
B. When taking a sample from the population, the variable involved will always be qualitative.
C. A population is the object upon which we collect data.
D. The definition of a census is the decennial census of the United States of America.
Question: 4. What is the variance of this data sample?
A. 34.79
B. 4.31
C. 5.90
D. 243.5
Question: 5. 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 class of 50 statistics students earned an average grade of 73.5.
C. The city business office reported 35 building permits for new single-family housing units.
D. 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.
Question: 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 Small
Airlines Airlines
$4.36 $1.60
6.19 -1.98
-0.42 1.03
3.73 -0.21
0.26 -1.15
6.27 4.19
0.59
1.52
1.97
4.57
0.05
A. The large airlines have a mean earnings per share of 3.40, and the small airlines have a standard deviation of 2.08.
B. The large airlines have a mean earnings per share of 3.40, and the small airlines have a mean earnings per share of 1.22.
C. The large airlines have a standard deviation of 2.88, and the small airlines have a standard deviation of 4.04.
D. The large airlines have a variance of 4.04, and the small airlines have a variance of 8.30.
Question: 7. Consider the following chart:
Business Planning Software Price ($)
GOFAR 61,500
SIMPLE Software 4,600
E-Manager 335
LAND-O 49
Entre-2 117
Year-to-Date 405
Yale Business Planner 233
In the Black 710
SYBIL 20/20 375
Macroficient 606
Orion 11 299
Pathmaker 250
Proplanner 999
Quickstepper 798
Selectronic 196
Taskmaster 311
Which of the measures of central tendency would best represent that data?
A. Mean
B. Mode
C. Median
D. Standard deviation
Question 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.
Question 9: 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. 45
B. 25
C. 5
D. 35
Question 10: Several ways to make a bar graph deceptive appear below. Which of these is sometimes used to exaggerate differences from one data value to the next?
A. Making the graph taller than it needs to be
B. Starting the vertical axis at a point greater than zero
C. Making the graph shorter than it needs to be
D. A gap in the vertical axis
Question: 11. Which of the following statements about interpreting standard deviation is true?
A. 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.
B. Neither the Empirical Rule nor Chebyshev's Rule can be applied to data unless the frequency distribution is mound-shaped and symmetrical.
C. 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.
D. Neither Chebyshev's Rule nor the Emprical Rule require any assumptions about the frequency distribution.
Question: 12 What is the mean of this data sample?
A. 7
B. There's no mean value.
C. 9.25
D. 8
Question: 13. 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. 2.56
B. 1.6
C. 2.844
D. 1.687