Sampling and Surveys

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

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

• True

• False

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

• biased

• unbiased

Determine if the following population would best be studied using the entire population or a sample.

Students in the state of Texas

• Entire Population

• Sample

• I love science!

Identify the Sample:
A restaurant wants to know if customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert.

• 20 customers

• All customers

• 8 customers

• Dessert

A survey is conducted to find out the average number of hours students study per week. The survey is distributed online, but only students who are frequently online respond. What type of bias is this?

• Selection bias

• Voluntary response bias

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