Use the data in Example 20.2 to determine the size of the sample you need if you

Question:

Use the data in Example 20.2 to determine the size of the sample you need if you want a level of precision of .05.

Example 20.2

Simple Random Sampling to Determine the Proportion of College-
Bound High School Seniors. Suppose we want to determine the proportion of college-bound high school seniors in a class of 500. A survey of 30 randomly selected students reveals that 19 will be attending college. Given this information, we want to estimate the population proportion p: image text in transcribed

To estimate our confidence interval, we need to calculate an unbiased estimate of the variance of the population proportion: image text in transcribed