A librarian wants to find out how much time patrons spend at the library in a week. He uses the questionnaire. List two ways to improve the questionnaire. Answer

1. Identify that a possible response is missing

The questionnaire starts with the option $1$-$2$ hours, so a patron who spends $0$ hours at the library cannot answer accurately.

Add an option such as $0$ hours' or $0$-$1$ hours'.

2. Identify that the grouping of times can be improved

The intervals are not of equal width: $1$-$2$, $3$-$4$, $5$-$7$, and over $7$.

Use equal class intervals where possible, for example $0$-$2$, $3$-$5$, $6$-$8$, over $8$.