Population Proportion Answers

The yearbook committee polled 80 randomly selected students from a class of 320 ninth graders to see if they would be willing to pay more for a yearbook if their names were printed on the front. Of the students who were surveyed, 26 of them said they would be willing to pay extra.

With a desired confidence of 90%, which has a z*-score of 1.645, which statements are true? Check all that apply.E = z*

Zarina wants to determine a confidence interval based on a random poll she conducted about the percent of attendees at a conference who are vegetarian. She determined the margin of error for her poll results using the equation below.E = 1.96

A recent poll of 85 randomly selected cable subscribers found that 39% would be willing to pay extra for a new nature channel.

The latest poll of 400 randomly selected residents showed that 288 of them are hoping that the old town cinema stays open on Main Street.

Ivan surveyed 49 randomly selected players from the 134 players of the soccer club teams to see if they wanted the games to be played on Saturdays or Sundays. Twenty-two of the players said that they preferred that the games be played on Saturdays. Ivan correctly determined that the margin of error, E, of his survey using a 99% confidence interval (z*score 2.58) is approximately 18%

Sarah polled 40 randomly selected students at her high school and found that 20% ( = 0.2) are happy with the quality of the cafeteria food.

With a desired confidence of 99%, which has a z*-score of 2.58, which statements are true? Check all that apply.E = z*