Chapter 10.1, Problem 10.13E

(a)

To determine

To Calculate: the percent that explain the nature of the relationship between time.

Explanation of Solution

Given:

Extracurricular activities (hours per week)
	<2	2 to 12	>12
C or better	11	68	3
D or F	9	23	5

Calculation:

Extracurricular activities (hours per week)
	<2	2 to 12	>12	Total
C or better	11	68	3	82
D or F	9	23	5	37
Total	20	91	8	119

Percents that explain the nature of the relationship between performance and time

		<2	2 to 12	>12
C or better	Observed	11	68	3
	% of column	55.0%	74.7%	37.5%
D or F	Observed	9	23	5
	% of column	45.0%	25.3%	62.5%

(b)

To determine

To construct: the graph which shows these percents graphically and brief summary.

Explanation of Solution

  

Graph:

  

Seeing from the graph less than 2 hours of extracurricular activities about 50% of then would have earned a C or better. 2 to 12 hours of extracurricular activities, the majority would receive a C or better and more than 12 hours of extracurricular activities, the majority would receive a D or F which is looking forth.