b. Suppose a college student is selected at random. Use the empirical rule to estimate how
likely it is that this student studies between 17.5 and 20 hours per week.
i. About 50% of the time
ii. About 81.5 chances in 100
iii. About 13.5 chances in 100
iv. About 2.5 chances in 100
c. Suppose a college student is selected at random. Use the empirical rule to estimate how
likely it is that this student studies more than 20 hours per week.
i. About 50% of the time
ii. About 81.5 chances in 100
iii. About 13.5 chances in 100
iv. About 2.5 chances in 100
3. Class on Facebook?
A 2012 study measured "the efficacy of social networking systems as instructional tools." The
study surveyed 186 students about the use of social networking systems as an active part of the
semester class structure. One question asked and answered by 181 of the 186 students, along
with the results received, is shown below.
Question from the study:
There are no specific benefits that make Facebook a better forum for class discussions and
announcements than a learning management system like Blackboard. Do you agree or disagree?
Make sure you can read the table. If you are having trouble interpreting the data, ask your
instructor to explain it. The mean of these 181 answers is 3.15, and the standard deviation is 1.05.
1
TABLE 6.2 Study Results'
Number of Subjects
Choosing This Response
Response
1- Strongly Disagree
2- Disagree
3-Neutral/Undecided
4- Agree
5- Strongly Agree
9
43
59
52
18
facebook
1 Buzzetto-More, N. "Social Networking in Undergraduate Education, "Interdisciplinary Journal of Information, Knowledge, and Management Volume 7, 2012.
Beyond the Numbers: A Student-Centered Approach for Learning Statistical Reasoning 133
