Random Samples

12 ounce shampoo bottle lasts Mike 16 weeks.  How long would you expect an 18-ounce bottle of the same brand to last him?

• 24 weeks
• 6 weeks
• 30 weeks
• 20 weeks

Tags

CCSS.6.RP.A.3B

A grading machine can grade 48 multiple-choice tests in 1 minute.  How log will it take the machine to grade 300 tests?

• 6 minutes
• 6.25 minutes
• 5.25 minutes
• 5 minutes

Tags

CCSS.6.RP.A.3B

Gio surveys 40 Quick Trip employees. He reports that 5 out of 15 fast-food employees are satisfied with their hourly pay rate. What percentage of employees are happy with their pay rate?

• 40%
• 33%
• 12.5%
• 38%

According to a random telephone survey, 85% of all working adults in the U.S. are satisfied with their current job. If I asked 500 adults, how many do you predict would be satisfied with their current job?

• 85 adults
• 340 adults
• 500 adults
• 425 adults

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

According to a random telephone survey of 200 adults, 75% of all working adults in the U.S. are satisfied with their current job. What is the population in this survey?

• 200 adults
• adults in the U.S.
• 75% of adults

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

Zoie completes a report by asking 70 students across campus. She found that 48% of CTMS students do not wash their hands after using the bathroom. What is the population of her survey?

• the bathroom
• CTMS students
• 48% of students 

Zoie completes a report by asking 70 students across campus. She found that 48% of CTMS students do not wash their hands after using the bathroom. What is the sample size?

• 48
• 100
• 70
• CTMS students

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Ms. Wilson concludes that 85% of the students in the school have at least one pet after she conducts a survey of 25 students in her class. Is this survey a census or a sample?

• census
• sample
• not enough information to tell
• both

Manny wants to know how many students at CTMS enjoy solving math problems. What is the best sampling method?

• ask for 20 volunteers to discuss whether they enjoy solving math problems
• ask the last 20 people to arrive at CTMS 
• Randomly ask 2 students in the hallway
• Ask every 20th student that walks into school

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Darrien surveys 60 of the actors theater class. He concludes that 8 out of 15 actors have previous acting experience. What is the sample size?

• 60
• 8
• 15
• 53

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2