This problem is a checkpoint for displays of data. It will be referred to as Checkpoint 9A.

For the information in parts (a) and (b), create a histogram. For the information in parts (c) and (d), create a box plot and then identify the quartiles and interquartile range.

1. Hours spent on homework by the different students: $0$, $4$, $0$, $1$, $1$, $1$, $\frac { 1 } { 2 }$, $1\frac{1}{2}$, $2$, $2$, $\frac { 1 } { 2 }$, $2$, $2$, $2$, $1\frac{1}{2}$, $1\frac{1}{2}$, $1$, $1$, $2$, $4$, $\frac { 1 } { 2 }$, $\frac { 1 } { 2 }$, $2$

2. Quiz scores: $3,15,18,14,10,14,19,8,14,14,15,19,9$

3. Parent ages: $47,52,50,47,51,46,49,46,48$

4. Test scores: $76,90,75,72,93,82,70,85,80$

Check your answers by referring to the Checkpoint 9A materials materials located at the back of your book.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 9A materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.