Chapter 25, Problem 25.34E

a.

To determine

To test: Whether there is any significant difference between the proportion of 14 to 18 year old girls who have played or not played games and have involved in serious fights.

To find: The two sample proportions, test statistic and the P-value.

b.

To determine

To test: Whether there is any significant difference between the proportion of girls who have played or not played video games and the results of serious fights.

To find: The chi-square test statistic and P-value.

c.

To determine

To show: The chi-square test statistic and the square of a z statistic are the same.

d.

To determine

To check: Whether z test can be used for the given situation.

To find: The most important difference between the chi-square test and z test.