Poll finds that 54% of the 600 people polled favor the incumbent. shortly after the poll is taken, it is disclosed that he had an extramarital affair. a new poll finds that 50% of the 1030 polled now favor the incumbent. we want to know if his support has decreased. the test statistic is a. z = -2.57. b. z = 1.56. c. z = -1.55.

A. z = -2.57

Step-by-step explanation:

Let p be the population proportion of people polled favor the incumbent.

As per given , we have

Sample size : n= 1030

sample proportion :  

Test statistic for proportion :

Hence, the  test statistic is z = -2.57 .

Thus , the correct answer is A. z = -2.57 .

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