Predictions and Percent with Samples

A principal randomly chooses 40 students from grade 5. Of these students, 9 were wearing watches. Based on this information, what is the most reasonable prediction of the number of students wearing watches in a group of 120 students?

• 27

• 9

• 18

• 80

Making a prediction in statistics is a

• random guess

• 100% accurate fact

• using a magic 8 ball

• using previous information to determine how likely something is to happen

A poll was taken of Hobby Middle School, 25 out of 30 students said they would prefer pizza on Friday’s. Out of 1200 students, what is a reasonable prediction of how many students would prefer pizza on Fridays?

• 100

• 1000

• 10

• 1

You did a survey and found out 65% of people like mustard on their hot dog. If there are 2,500 residents of a town, predict how many would say they like mustard on their hot dog.

• 65

• 1,625

• 2,000

• 2,500

• 13
• 14
• 15
• 16

A travel club has 3,000 members. A random sample of 50 of the club members found that 12 people like mountain vacations best. Which statement is NOT supported by the sample data?

• Twenty-four percent of those sampled say they like mountain vacations best.

• An estimated 720 club members would likely say they enjoy mountain vacations best.

• Almost one-quarter of club members would likely say they enjoy mountain vacations best.

• More than 2,500 club members would likely say they prefer other vacations over mountain vacations.

• 10820
• 10920
• 11820
• 11920