ISOM
ISOM 2500 L5,6,7 Assignment 1
1. This table summarizes results from a survey of more than 30,000 North
American households that ask, “What kind of Internet connection do you use at home?” Type
2003
(%)
2007
(%)
Cable
16
33
DSL
8
33
Satellite
0
1
Wireless
0
2
Dial-up
68
26
(a) Prepare a chart that shows the shares in both years as well as identifies the technologies that are growing or fading
(b) Does this table prove that fewer households were using dial-up in 2007 than in
2003?
2.
A survey of the competition between two new handheld games produced the
following data. A magazine in Japan surveyed 1,000 of its readers; 140 reported owning a Sony PSP and 250 reported that they owned a Nintendo DS. In addition, the two groups reported owning the following number of games. (Because systems like
PSP can be used to play a certain type of DVD, it is possible that someone might have one and not own any games!)
Number of games
Sony PSP
(%)
Nintendo DS
(%)
0
2
2
1
27
16
2
25
20
3
14
19
4
8
12
5
10
8
>5
14
23
(a) Is a pie chart of either column appropriate?
(b) In order to show a bar chart of the number of owners rather than percentages, what must be done to the table first?
(c) Use a single chart to compare the number of games owned by these respondents.
Are percentages or counts more natural for this comparison?
(d) What is the median number of games bought by an owner of the Sony? Of the
Nintendo?
(e) How do you interpret the differences in game ownership between those who own a PSP and those who own a DS?
3.
The attached excel (car.xls) gives the rated highway gasoline mileage (in miles per gallon) for 233 cars sold in the United States during 2003 and 2004.
(a) Produce a histogram of these data. Describe and interpret the histogram.
(b) Compare the histogram to the boxplot. What does the histogram tell you
1. This table summarizes results from a survey of more than 30,000 North
American households that ask, “What kind of Internet connection do you use at home?” Type
2003
(%)
2007
(%)
Cable
16
33
DSL
8
33
Satellite
0
1
Wireless
0
2
Dial-up
68
26
(a) Prepare a chart that shows the shares in both years as well as identifies the technologies that are growing or fading
(b) Does this table prove that fewer households were using dial-up in 2007 than in
2003?
2.
A survey of the competition between two new handheld games produced the
following data. A magazine in Japan surveyed 1,000 of its readers; 140 reported owning a Sony PSP and 250 reported that they owned a Nintendo DS. In addition, the two groups reported owning the following number of games. (Because systems like
PSP can be used to play a certain type of DVD, it is possible that someone might have one and not own any games!)
Number of games
Sony PSP
(%)
Nintendo DS
(%)
0
2
2
1
27
16
2
25
20
3
14
19
4
8
12
5
10
8
>5
14
23
(a) Is a pie chart of either column appropriate?
(b) In order to show a bar chart of the number of owners rather than percentages, what must be done to the table first?
(c) Use a single chart to compare the number of games owned by these respondents.
Are percentages or counts more natural for this comparison?
(d) What is the median number of games bought by an owner of the Sony? Of the
Nintendo?
(e) How do you interpret the differences in game ownership between those who own a PSP and those who own a DS?
3.
The attached excel (car.xls) gives the rated highway gasoline mileage (in miles per gallon) for 233 cars sold in the United States during 2003 and 2004.
(a) Produce a histogram of these data. Describe and interpret the histogram.
(b) Compare the histogram to the boxplot. What does the histogram tell you