Before the presidential debates, the percentages of

registered voters favouring various candidates were expected to be as follows.

After the presidential debates, a random sample of 1200

voters showed that 530 favoured the Democratic candidate, 400 were in favour of

the Republican candidate, 165 were in favour of the Independent candidate, and

105 were undecided. We want to see if the proportion of voters has changed. Compute

the test statistic.