In th

e last presidential election, before the candidates started

their major campaigns, the percentages of registered voters who favored the

various candidates were as follows.

After the major campaigns began, a random sample of 400 voters

showed that 172 favored the Republican candidate; 164 were in favor of the

Democratic candidate; and 64 favored the Independent candidate. We are

interested in determining whether the proportion of voters who favored the

various candidates had changed.

Compute the test statistic (c²).