Jury selection. Exercise 8.107 (page 489) concerns Casteneda v. Partida, the case in which the Supreme Court decision used the phrase “two or three standard deviations” as a criterion for statistical significance. There were 181,535 persons eligible for jury duty, of whom 143,611 were Mexican Americans. Of the 870 people selected for jury duty, 339 were Mexican Americans.

We are interested in finding out if there is an association between being a Mexican American and being selected as a juror. Formulate this problem using a two-way table of counts. Construct the 2 × 2 table using the variables “Mexican American or not” and

“juror or not.” Find the X2 statistic and its P-value. Square the z statistic that you obtained in Exercise 8.107 and verify that the result is equal to the X2 statistic.