Random Sampling and Data Inferences

A sample should be

• representative of  only middle school students only
• a very large group
• representative of the population
• representative of people who volunteer

Jasmin completes a report by asking 70 students across campus. She found that 48% of 6th grade students do not wash their hands after using the bathroom. What is the sample size?

• 48

• 100

• 70

• 6th grade students

A recent survey of 800 seventh graders from across the state shows 4 out of 10 like to play paper football. How many students said they like to play paper football?

• 40 students
• 200 students 
• 320 students
• 8,000 students

Each dot represents 1 day. How many days were recorded?

• 9
• 21
• 20
• 105

Terry made the dot plot above to chart the amount of time, in minutes, that it took students to eat breakfast in the morning. How many students took 5 or more minutes to eat their breakfast?

• 11

• 12

• 14

• 16

What type of statistical representation did Mia use to report her sample data?

• Box plot

• Circle graph

• Bar graph

• Dot plot

What type of statistical representation did Emmarie use to report her sample data?

• Line Graph

• Box plot

• Bar graph

• Dot plot

A shipment to a warehouse consists of 5,000 laptop computers. The manager chooses a random sample of 50 laptop computers and finds that 2 are defective. How many laptop computers in the shipment are likely to be defective?

• 40 computers

• 200 computers

• 50 computers

• 2000 computers

There are 1,200 licensed dogs in Donna. A random sample of 20 dogs in Donna shows that 3 have ID microchips implanted. How many dogs in Donna are likely to have ID microchips implanted?

• 60 dogs

• 400 dogs

• 1,020 dogs

• 180 dogs

A metal-fabricating company produces 150,000 souvenir tokens each year. In a random sample of 400 tokens, 3 have stamping errors. Predict the total number of coins that will have stamping errors in a year.

• 1,125 coins

• 515 coins

• 11,250 coins

• 20 coins