Exam- DATA-DESCRIPTION, COLLECTION, AND SAMPLING

1

. 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

. rightward skewed

.B

. uniform

.C

. leftward skewed

.D

. normal

.2

. 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

. 77

B

. 77

.7

C

. 77

.5

D

. 88

3

. Consider the following distribution:

Which of the following would you expect?

A

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

.B

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

.C

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

.D

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

.4

. 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

5

. Which of the following are parameters of a population?

A

. ? and x

B

. ? and ?

C

. ? and n

D

. ? and ?

6

. 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

. 4

.31

B

. 34

.79

C

. 5

.90

D

. 243

.5

7

. 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

. 88

B

. 77

C

. 77

.7

D

. 77

.5

8

. When obtaining data by _______ it's most important to inquire about the purposes of the original

experimenter

.A

. collecting data observationally

B

. performing a designed experiment

C

. conducting a survey

D

. reading a published source

9

. Consider the following chart:

Which of the measures of central tendency would best represent that data?

A

. Median

B

. Mode

C

. Mean

D

. Standard deviation

10

. 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

. 2

.56

B

. 1

.44

C

. 2

.84

D

. 1

.687

11

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

data?

A

. Pie chart

B

. Dot plot

C

. Stem-and-leaf plot

D

. Histogram

12

. 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

. 25

C

. 45

D

. 5

13

. Use the following data sample to answer the question

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

What is the variance of this data sample?

A

. 243

.5

B

. 34

.79

C

. 5

.90

D

. 4

.31

14

. 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 standard deviation of 2

.88, and the small airlines have a standard deviation of 4

.04

.C

. 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

.D

. The large airlines have a variance of 4

.04, and the small airlines have a variance of 8

.30

.15

. Which of the following statements is true?

A

. The definition of a census is the decennial census of the United States of America

.B

. A population is the object upon which we collect data

.C

. In a true census, no inferential statistics can be done, because the entire population is the sample

.D

. When taking a sample from the population, the variable involved will always be qualitative

.End of exam

16

. 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

. 8

B

. 9

.25

C

. 7

D

. There's no mean value

.17

. What is the difference between a histogram and a bar chart?

A

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

.B

. A histogram and a bar chart both reflect qualitative data

.C

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

.D

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

.18

. 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

.19

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

A

. average of the two end values

.B

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

.C

. value that appears in the center

.D

. value that appears the greatest number of times

.20

. 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

. Inferential statistics

C

. Independent events

D

. Descriptive statistics