Summarizing data
Exercise 1:
In an attempt to describe cholesterol level in children 2 to 6 years of age a sample of 9
participants is selected and cholesterol is measured as follows:
185, 225, 240, 196,175, 180, 194, 147, 223
1.
2.
3.
4.
Compute the sample mean, median and mode
Compute the range, standard deviation and interquartile range
Which is the better measure of central tendency? Dispersion? Justify.
How would this data be best represented?
Exercise 2:
The graph in the above figure presents total cholesterol levels in boys and
girls 10 to 15 years of age.
1. What type of graph is presented in the above figure?
2. What is the median?
3. What proportion of boys has total cholesterol level less than 205?
4. What proportion of girls has total cholesterol level less than 205?
Exercise 3:
Present the education data for the 25 individuals in the table below in an appropriate frequency
distribution and 2 different graphs.
Legend:
1 = none; 2 = primary; 3 = intermediate; 4 = high school; 5 = technical school; 6 = university
Table1: Data for a sample of 25 individuals from the Honolulu Heart
Id
education
Id
education
1
2
14
2
2
1
15
3
3
1
16
4
4
2
17
3
5
2
18
5
6
4
19
1
7
1
20
4
8
3
21
1
9
5
22
3
10
2
23
2
11
4
24
2
12
1
25
3
13
1