We are studying the proportion of cities that have private garbage collector. we want a maximum error of 0.10 and a 95% confidence level, and tentatively estimate the proportion at 0.50. what is the minimum number of cities we need to contact?

The minimum number of cities we need to contact is 96.

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 .

The margin of error is:

95% confidence interval

So , z is the value of Z that has a pvalue of , so .

In this problem, we have that:

The minimum number of cities we need to contact is 96.

your answer is the frist one

hop i

x² + 11x + 18 < 0  

[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2  

solution: (-9, -2)

step-by-step explanation: