A 95% confidence interval for the population proportion of professional tennis players who earn more than 2 million dollars a year is found to be between .82 and .88. Given this information, the sample size that was used was approximately: a. 382 b. 233 c. 387 d. 480 e. 545

e. 545

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , 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:

The estimate is the mean of the two bounds. So

95% confidence level

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

The lower limit of this interval is:

In this question, L = 0.82. So

So the correct answer is:

e. 545

a) what number, when added to negative four, is equal to negative five?

step-by-step explanation: