Reference no: EM131399229
Refer to Exercise. Students also were asked what grades they usually get in school. For twelfth-grade students who responded to this question and the question about how often they wear seatbelts when driving, a summary of frequency counts for combinations of responses to the two questions is as follows:
|
Usual School Grades |
|
Wears Seatbelt |
A snd B |
C |
D and F |
Total |
Never |
52 |
32 |
18 |
102 |
Rarely |
128 |
93 |
22 |
243 |
Sometimes |
166 |
104 |
8 |
278 |
Most times |
298 |
128 |
24 |
450 |
Always |
1056 |
300 |
41 |
1397 |
Total |
1700 |
657 |
113 |
2470 |
a. The total number of students in the table is 2470. What percentage of these 2470 students said that they usually get A's and B's in school?
b. What percentage of the 1700 students who said that they usually get A's and B's said that they always wear a seatbelt when driving?
c. What percentage of the 657 students who said that they usually get C's said that they always wear a seatbelt when driving?
d. What percentage of the 113 students who said that they usually get D's and F's said that they always wear a seatbelt when driving?
Exercise
Table 2 summarized frequency of seatbelt use while driving for twelfth-grade participants in the 2003 Youth Risk Behavior Surveillance System (YRBSS) survey. In 2001, YRBSS survey students were asked the same question. For the 2001 survey, a summary of responses given by 2530 students in the twelfth grade who said that they drive follows.
Wears Seatbelt
|
Frequency
|
Never
|
105
|
Rarely
|
248
|
Sometimes
|
286
|
Most times
|
464
|
Always
|
1427
|
a. What percent of the twelfth-grade students who drive said that they always wear a seatbelt when driving?
b. What percent of the twelfth-grade students who drive said that they do not always wear a seatbelt when they drive?
c. Find the percentage in each of the five response categories.
d. Draw a bar graph of the percentages found in part (c).
Table 2: Seatbelt Use by Twelth-Graders When Driving |
Response |
Count |
Percent |
Always |
1686 |
55.40% |
Most times |
578 |
19.00% |
Sometimes |
414 |
13.60% |
Rarely |
249 |
8.20% |
Never |
115 |
3.80% |
Total |
3042 |
100% |
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