4.1b Methods of Sampling

If I wanted to know how many blades of grass are inside the track, which sampling method could I use?

• Have my students count every blade of grass
• Guess
• Divide the grassy area into 1 inch sections, randomly pick several sections to count, average them together and multiply that by the total square inches.

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Sam tested every 50th candy bar from the assembly line to make sure there were enough peanuts in each bar.  He found 15% did not have enough peanuts.  How many candy bars do not have enough peanuts if the factory produces 20,000 candy bars?

• 300
• 3,000
• 300,000
• 50

Tags

CCSS.7.EE.B.3

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Sam tested every 50th candy bar from the assembly line to make sure there were enough peanuts in each bar.  He found 15% did not have enough peanuts.  Which type of sampling did he use?

• Voluntary
• Interval
• Convenience

Several students were surveyed about their favorite drinks. 11 orange soda, 17 pepsi, 10 coke, and 12 said grape. What percent of students like coke as their favorite?

• 2%
• 10%
• 20%
• 50%

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

The table shows the results of a survey of 200 people attending a hockey game.
The attendance for the hockey game is about 25,000 visitors each game.  Based on the table, how many people out of 25,000 could be expected to buy a pennant?

• 1,375
• 1,650
• 2,750
• 3,850

Tags

CCSS.6.RP.A.3B

A high school has 1500 students.  In a random sample of 50 students, 32 own one or more pets.  Predict the number of students at the high school who own one or more pets.

• 480
• 960
• 48
• 96

Tags

CCSS.7.RP.A.2

CCSS.7.SP.A.1

CCSS.7.SP.A.2

After a major flood, a disaster area was divided into 100 zones. Researchers contacted everyone from 20 of those zones to find out how they could best be helped by governmental disaster relief funds. Describe the sampling technique used by the researchers.

• SRS

• systematic

• stratified

• cluster

• convenience

Tags

CCSS.HSS.IC.B.3

A researcher divided subjects into two groups according to gender and then selected members from each group for her sample. What sampling method was the researcher using?

• cluster

• random

• systematic

• stratified

• SRS

Tags

CCSS.HSS.IC.B.3