## Transcribed Text

Chapter 2, Exercise:
7. For the data from the 1977 Stat. and Biom. 200 class for eye color, construct:
a. pie graph
b. horizontal bar graph
c. vertical bar graph
d. a frequency table with the relative frequency of each eye color
Eye Color Number of Students
Brown 11
Blue 10
Green 4
Gray 1
9. Which of the box plots
on the graph has a large
positive skew? Which has
a large negative skew?
Chapter 3 Exercise:
6. You recorded the time in seconds it took for 8 participants to solve a puzzle.
These times appear below. However, when the data was entered into the statistical
program, the score that was supposed to be 22.1 was entered as 21.2.
You had calculated the following measures of central tendency: the mean, the
median, and the mean trimmed 25%. Which of these measures of central tendency
will change when you correct the recording error?
Time (seconds)
15.2
18.8
19.3
19.7
20.2
21.8
22.1
29.4
ADHD Treatment (AT) case study
30. (AT) What is the mean number of correct responses of the participants after
taking the placebo (0 mg/kg)?
31. (AT) What are the standard deviation and the interquartile range of the d0
condition?
eRources Illowsky et al.
Chapter 2 Exercise:
78. Twenty-five randomly selected students were asked the number of movies they watched the
previous week. The results are as follows.
a. Construct a histogram of the data.
0
0.5
1
1.5
2
2.5
0.04 to 0.2 0.3TO 0.16 0.17 TO 0.23 0.24 TO 0.35 0.30 TO 0.40
No. of Frequncies
Visited the movies
b. Complete the columns of the chart.
# of Movies Frequency Relative Frequency Cumulative Relative Frequency
0 5 0.20 0.20
1 9 0.36 0.56
2 6 0.24 0.80
3 4 0.16 0.96
4 1 0.04 1.00
Total 25 1.00
80. If the data were collected by asking the first 111 people who entered the store, then the type of
sampling is:
a. cluster
b. simple random
c. stratified
d. convenience
84. Given the following box plot:
Figure 2.41
a. which quarter has the smallest spread of data? What is that spread?
b. which quarter has the largest spread of data? What is that spread?
c. find the interquartile range (IQR).
d. are there more data in the interval 5–10 or in the interval 10–13? How do you know this?
e. which interval has the fewest data in it? How do you know this?
i. 0–2
ii. 2–4
iii. 10–12
iv. 12–13
v. need more information
88. Given the following box plots, answer the questions.
Figure 2.45
a. In complete sentences, explain why each statement is false.
i. Data 1 has more data values above two than Data 2 has above two.
ii. The data sets cannot have the same mode.
iii. For Data 1, there are more data values below four than there are above four.
b. For which group, Data 1 or Data 2, is the value of “7” more likely to be an outlier? Explain why in
complete sentences

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