BNAL 206 QUESTIONS AND VERIFIED ANSWERS
A method for summarizing data simultaneously on two categorical variables is a
a) stem and leaf display
b) histogram
c) contingency table
d) Pareto chart - Answers - C.
If the median income of households in Norfolk is $45000, then
a) approximately 50% of the households have incomes above $45000
b) the mean income is also $45000
c) the mode of incomes is $45000
d) the width of the box in a boxplot of the incomes is $45000 - Answers - A.
A survey was conducted to determine how people rated the quality of programming
available on television. Fifteen respondents were asked to rate the overall quality from 0
(no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data
is shown below.
Stem Leaves
32
4 034778
5 0127
6 17
71
8
92
For this plot, the leaf unit = 1.
3. How many of the respondents rated overall television quality with a rating of less than
50?
a) 7
b) 8
c) 13
d) 15 - Answers - A.
A survey was conducted to determine how people rated the quality of programming
available on television. Fifteen respondents were asked to rate the overall quality from 0
(no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data
is shown below.
Stem Leaves
32
4 034778
, 5 0127
6 17
71
8
92
For this plot, the leaf unit = 1.
4. What is the median of the quality ratings?
a) 50
b) 51
c) 51.5
d) 60 - Answers - A.
Question 5 refers to the following relative frequency distribution for the times kept on
hold before a customer service representative responds for a sample of customer calls
made to an 800 number for a national financial services corporation.
Relative
Time (in Minutes) Frequency
0 but less than 5 0.37
5 but less than 10 0.22
10 but less than 15 0.15
15 but less than 20 0.10
20 but less than 25 0.07
25 but less than 30 0.07
30 or more 0.02
5. The cumulative relative frequency for the class "5 but less than 10" is
a) .15
b) .59
c) .74
d) .84
e) 1.00 - Answers - B.
Questions 6-8 can be answered using the following summary of the Math SAT scores
for all tests taken in 2015 within a large northeastern state.
Lowest score 240
10'th percentile 350
25'th percentile 400
75'th percentile 640
90'th percentile 690
Highest score 800
Mean 520
Median 510
Standard Deviation 100
A method for summarizing data simultaneously on two categorical variables is a
a) stem and leaf display
b) histogram
c) contingency table
d) Pareto chart - Answers - C.
If the median income of households in Norfolk is $45000, then
a) approximately 50% of the households have incomes above $45000
b) the mean income is also $45000
c) the mode of incomes is $45000
d) the width of the box in a boxplot of the incomes is $45000 - Answers - A.
A survey was conducted to determine how people rated the quality of programming
available on television. Fifteen respondents were asked to rate the overall quality from 0
(no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data
is shown below.
Stem Leaves
32
4 034778
5 0127
6 17
71
8
92
For this plot, the leaf unit = 1.
3. How many of the respondents rated overall television quality with a rating of less than
50?
a) 7
b) 8
c) 13
d) 15 - Answers - A.
A survey was conducted to determine how people rated the quality of programming
available on television. Fifteen respondents were asked to rate the overall quality from 0
(no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data
is shown below.
Stem Leaves
32
4 034778
, 5 0127
6 17
71
8
92
For this plot, the leaf unit = 1.
4. What is the median of the quality ratings?
a) 50
b) 51
c) 51.5
d) 60 - Answers - A.
Question 5 refers to the following relative frequency distribution for the times kept on
hold before a customer service representative responds for a sample of customer calls
made to an 800 number for a national financial services corporation.
Relative
Time (in Minutes) Frequency
0 but less than 5 0.37
5 but less than 10 0.22
10 but less than 15 0.15
15 but less than 20 0.10
20 but less than 25 0.07
25 but less than 30 0.07
30 or more 0.02
5. The cumulative relative frequency for the class "5 but less than 10" is
a) .15
b) .59
c) .74
d) .84
e) 1.00 - Answers - B.
Questions 6-8 can be answered using the following summary of the Math SAT scores
for all tests taken in 2015 within a large northeastern state.
Lowest score 240
10'th percentile 350
25'th percentile 400
75'th percentile 640
90'th percentile 690
Highest score 800
Mean 520
Median 510
Standard Deviation 100
