Discussion:
1. If there are an odd number of data values in a set, the median will be the (exam250711)
A. value that appears the greatest number of times.
B. average of all of the values divided by the number of values in the set.
C. value that appears in the center.
D. average of the two end values.
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 variance for the data values?
A. 1.687
B. 2.56
C. 1.6
D. 2.844
3. 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. 9.25
B. 8
C. There's no median value.?D.7
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. When obtaining data by it's most important to inquire about the purposes of the original
experimenter.
A. performing a designed experiment
B. conducting a survey
C. reading a published source
D. collecting data observationally
6. When creating a histogram, it's important to ensure that the classes of data satisfy which properties?
A. They must include each interval on the number line.
B. They must be all the same size.
C. No requirements are made; the individual creating the graph is free to choose any classes.
D. They must be mutually exclusive and exhaustive.
7. 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. Starting the vertical axis at a point greater than zero
B. Making the graph shorter than it needs to be
C. Making the graph taller than it needs to be
D. A gap in the vertical axis
8. 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 mode for the data?
A. 77.7
B.77
C. 88
D. 77.5
9. Which of the following statements is true about a stem-and-leaf plot?
A. It involves creating columns of dots, one for each datum in the sample.
B. It separates data at the decimal point, creating horizontal rows whose values are close together.
C. It uses vertical bars to illustrate a probability distribution.
D. Stem-and-leaf plots are histograms whose bars have been arranged in decreasing order of frequency.
10. 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
11. 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. We can't know the answer without knowing the population mean jjl and standard deviation a.
D. 1.4
12. When a sample is taken from a larger population, this suggests that which of the following will be used?
A. Computation of a sample mean
B. Descriptive statistics
C. Independent events
D. Inferential statistics
13. 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 median for the data?
A. 88
B. 77.5?C.77?D. 77.7
14. 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. 7
B. There's no mean value.
C. 8
D. 9.25
15. 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. 88
C. 77.5
D. 77.7
16. Which of the following involves inferential statistics as opposed to descriptive statistics?
A. The city business office reported 35 building permits for new single-family housing units.
B. A class of 50 statistics students earned an average grade of 73.5.
C. The Alcohol, Tobacco and Firearms department reported that Houston had 1,791 registered gun dealers in 1997.
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.
17. Which type of plot takes quantitative data and forms classes out of it, thus turning it into qualitative?data?
A. Pie chart
B. Stem-and-leaf plot
C. Histogram
D. Dot plot