Sampling and Survey

A survey of 976 American households found that 32% of the households own two cars.  Identify the the sample. {hint: a survey of what __)

• All American households

• 976 American households

• 32% of Americans own two cars

• two cars

A survey of 976 American households found that 32% of the households own two cars.  Identify the the population. {hint: which group was targeted... used for the survey}

• All American households

• 976 American households

• 32% of Americans own two cars

• two cars

4. A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

• Biased

• Unbiased

To get valid results, a sample must be...

• biased

• unbiased

Biased or Random?

Chloe and Danna want to determine the favorite subject of all students in the middle school. So they place every middle school student's name in a bucket and choose 30 to poll.

• Biased sample

• Random sample

The author of the statistical study was an observer at a police sobriety checkpoint at which every 5th driver was stopped and interviewed. Which sampling type is this?

• random

• systematic

• convenience

• stratified

• cluster

If I wanted to know how many blades of grass are inside the track, I can 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. Which sampling method did I use?

• simple random sample

• convenience

• stratified random sample

• systematic random sample

Interview every 10th student who enters the school in the morning.

• simple random

• voluntary response

• systematic

• convenience

What type of sampling is shown?

• Simple Random Sample

• Systematic Sample

• Cluster Sample

• Stratified Sample

True or False: all samples lead to a good prediction about an entire population.

• True

• False