Proportions to Predict Populations from Samples

An ice cream shop surveyed 200 random customers to find out which new ice cream flavor they enjoy the most. Results are shown in the table.

What percent of the customers prefer either peanut butter pop or green machine?

• 46%

• 54%

• 27%

• 8%

If there are 1,400 customers in a given week, how many would you expect to prefer chocolate strawberry or very berry mix?

• 490 customers

• 55 customers

• 280 customers

• 770 customers

A fitness center asked 80 random patrons how long they exercise on average each day. Results are shown in the table.

What percent of people surveyed exercise for more than an hour and a half?

• 57%

• 95%

• 40%

• 71.25%

A fitness center asked 80 random patrons how long they exercise on average each day. Results are shown in the table. If 300 people come to the gym on a given day, approximately how many would you expect to exercise for more than 135 minutes?

• 120 people

• 96 people

• 32 people

• 214 people

• 13
• 14
• 15
• 16

A sample of students is taken from the school's A honor roll. The school estimates that there are actually 360 students on the A honor roll. Using this sample from the table, how many students on the A honor roll are 8th graders?

• 126 8th graders

• 280 8th graders

• 172 8th graders

• 114 8th graders

• 10820
• 10920
• 11820
• 11920

If 140 people were surveyed, how many preferred crab?

• 98

• 42

• 5

• 30

What does this symbol represent?

• parameter

• sample proportion

• parameter of a population

• population proportion

What does this symbol represent?

• population proportion

• parameter

• sample proportion

• population sample