00:01
So in this question, we plan to conduct a survey to find the proportion.
00:05
So basically, we want to estimate here the proportion of the workforce that has two or more jobs.
00:13
And they want to find here with confidence level, the 95 % confidence level, with a margin of error equals to 4%.
00:24
And they also know in a pilot survey that they found a sample proportion equals to 8 out of the 52 that had two or more jobs.
00:35
So this value is 0 .1538.
00:38
And now to find the sample size, first, we need to find the critical value related to this 95 % confidence level, which is coming from the standard normal distribution.
00:49
And it is the value that has, in this case, the area here equals to what is left out of the 100%, which is 5%.
00:57
And then we divide this by 2...