Hugo collects data on the number of hours college students study each day, and finds that his respondents typically study for 3 hours, give or take $1 \frac{11}{2}$ hours in either direction.
"Typically" in this context refers to the __________
whereas "give or take" refers to the __________
a. Standard deviation / arithmetic mean
b. Arithmetic mean / standard deviation
c. Arithmetic mean $/ p$ value
d. $p$ value / standard deviation