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 .

step-by-step explanation:

the data of the detroit pistons in numerical order from least to greatest is 0.30, 0.37, 0.55, 0.62, 0.69, 0.72, 0.73, 0.75, 0.77, 0.78, 0.80, 0.81, 0.81, 0.83, 0.84, 0.89

the data of the miami heat in numerical order from least to greatest is 0.50, 0.50, 0.56, 0.57, 0.67, 0.72, 0.72, 0.72, 0.75, 0.75, 0.76, 0.81, 0.82, 0.90, 1.00, 1.00

the detroit pistons median : 1.52

the miami heat median: 1.47

the iqr of this data is 0.05