Lab Assignment on Chapter 2
A college student is interested in how many friends the average person has. She decides to count
the number of people who appear in photographs on display in dorm rooms and offices across
campus. She collects data on 84 students and 33 faculty members. The data are presented below.
1. Did you attend class on Friday? (5 pts)
a. Yes
2. What kind of visual display is this? (3 pts)
a. Grouped frequency histogram
3. Estimate how many people have less than 6 people pictured? (3 pts)
a. About 32 people
4. Estimate how many people have more than 18 people pictured. (3 pts)
a. About 31 people
5. Can you think of additional questions you might ask after reviewing the data displayed
here? (3 pts)
a. Why were the frequency intervals 15 and not a closer interval? Why is the
histogram skewed?
6. Below is a subset of the data described here. Create a grouped frequency table for these
data, using : (5 pts)seven groupings
153913018153357
7 7 11 3 12 20 16 4 17 15 16 1
6887317
Interval Frequency Midpoint
0-2 3 1.5
3-5 8 4.5
6-8 7 7.5
9-11 2 10.5
12-14 2 13.5
15-17 6 16.5
18-20 2 19.5
7. Create a from part (6). (4 pts)histogram of the individual data
*Feel free to create the histogram by hand or using Words (Insert => Chart => Statistical => Histogram),
but if you would like, you may use SPSS and copy and paste the output into this Word document.
8. Describe how the data depicted in the histogram you created in part (7) are . distributed
(4 pts)
a. The graph is positively skewed.
