Chapter 11.2, Problem 47E

(a)

To determine

To calculate: the percentage and create a bar chart showing the relation between time spent on extracurricular activities and results and description.

Explanation of Solution

Given:

  

Graph:

Histogram:

  

Calculation:

	<2	2 to 12	>12
C or better	0.55	0.7473	0.375
D or F	0.45	0.2527	0.625

If the tasks are between 2 and 12 hours a week, most passing grades are received. If the tasks are more than 12 hours a week, the least amount of passing grades are received.

(b)

To determine

To Explain: the reason that not perform a chi-square test in this setting.

Explanation of Solution

The chi-square test requires a minimum of 5 values. The cumulative column of more than 12 is 8 and so less than 5 is at least one of the estimated counts of more than 12. The chi-square test should also not be used.