He's taking, there's 150 students right over here. He's finding it impractical to survey all 150 to figure out the true population proportion. So instead, he samples 30 of the seniors. So n is equal to 30. And from that, he calculates a sample proportion. It looks like seven out of the 30 are they want the vegetarian option. And he's going to determine some confidence level and then construct a confidence interval.