humblemalak
25.12.2019 •
Mathematics
In a sample of 400 voters, 360 indicated they favor the incumbent governor. the 95% confidence interval of voters not favoring the incumbent is 0.871 to 0.929
0.120 to 0.280
0.765 to 0.835
0.071 to 0.129
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Ответ:
0.071 to 0.129
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence interval , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
For this problem, we have that:
In a sample of 400 voters, 360 indicated they favor the incumbent governor. This means that 400-360 = 40 do not favor the incumbent governor. So
95% confidence interval
So , z is the value of Z that has a pvalue of , so .
The lower limit of this interval is:
The upper limit of this interval is:
The correct answer is:
0.071 to 0.129
Ответ:
Step-by-step explanation: