MATH1342
Collin College
LAB 2
Spring 2015
NAME: _________________
Instructor: Daryl Rupp
DUE DATE: WE - 2/16/15
SCC - 2/17/15
PART I:
This lab involves making an informed decision based on a subjective comparison. We will
consider the important issue of car crash fatalities. Car crash fatalities are devastating to the
families involved and they often involve lawsuits and large insurance payments. Listed below are
the ages of 100 randomly selected drivers who were killed in car crashes. Also given is a
frequency distribution of licensed drivers by age.
1. Convert the given frequency distribution in Table 1 to a relative frequency distribution.
Round to 2 decimal places.
TABLE 1
Age
Number of licensed
drivers (in millions)
Age
16-19
9.2
16-19
20-29
33.6
20-29
30-39
40.8
30-39
40-49
37.0
40-49
50-59
24.2
50-59
60-69
17.5
60-69
70-79
12.7
70-79
80-89
4.3
80-89
Relative Frequency
2. Create a relative frequency distribution for the ages of drivers killed in car crashes in Table 1.
Use the same class limits as in Table 2. Round to 2 decimal places.
TABLE 2
Ages in years of drivers killed in car crashes
37 76 18 81
28
29
18 18 27 20
Age
Relative Frequency
18 17 70 87
45
32
88 20 18 28
17 51 24 37
24
21
18 18 17 40
25 16 45 31
74
38
16 30 17 34
16-19
20-29
30-39
34 27 87 24
45
24
44 73 18 44
16 16 73 17
16
51
24 16 31 38
86 19 52 35
18
18
69 17 28 38
69 65 57 45
23
18
56 16 20 22
40-49
50-59
60-69
70-79
77 18 73 26
58
24
21 21 29 51
80-89
17 30 16 17
36
42
18 76 53 27
3. Compare the two relative frequency distributions. Which age categories appear to have
substantially greater proportions of fatalities than the proportions of licensed drivers?
4. Construct a side-by-side bar graph that is effective in identifying age categories that are more
prone to fatal car crashes. (see figure 4. page 70 of the textbook for an example)
5. Write a report that compares the two relative frequency distributions. Include which age
categories appear to have substantially greater proportions of fatalities than proportions of
licensed drivers. This report should be written from the context of an insurance company and
their reason for setting higher auto insurance rates for these age categories. Discuss which
groups fatalities are disproportionately high compared to the proportion of licensed drivers. Use
complete sentences and proper grammar.
PART II:
1. A random sample of 25 healthy adults resulted in the following temperatures:
97.4
97.9
98.4
98.8
99.1
97.5
97.6
97.7
97.8
98.0
98.2
98.3
98.4
98.5
98.6
98.6
98.7
98.8
98.9
99.0
99.0
99.2
99.3
99.4
99.5
2. Find the maximum temperature:
Find the minimum temperature:
Fine the difference in temperatures
3. We are going to construct a 5 class distribution table. Find the class width (divide the
difference by 5 and round up to the next highest tenth).
4. Use 97.3 as the first Lower Class Limit. What are the other 4 Lower Class Limits?
5. What is the first Upper Class Limit?
What are the other 4 Upper Class Limits?
6. Find the Frequency of each Class and calculate the Relative Frequency for each class. Fill in
the table that follows.
CLASS
Lower Limit to
Upper Limit
----------------
FREQUENCY
RELATIVE
FREQUENCY
7. Create a Histogram using the Relative Frequency from the table above.
8. Describe The Distribution (using one of the names of the four distributions we discussed.