Different Sampling Methods

involves simply asking anyone who happens to be there if they would like to participate.  For instance, asking students in the library if they would be willing to complete a survey.

• random sampling

• convenience sampling

• volunteer sampling

• snowball sampling

Which of the following doesn’t result in some form of bias?

• Choosing AP students to survey regarding their GPA in order to estimate the average GPA in a school.

• Polling a group of potential voters outside a Republican campaign office in order to estimate the proportion of city residents who favor a particular candidate.

• Surveying people who work in the marketing department of a large corporation in order to assess employee satisfaction with management policies.

• Choosing a stratified random sample of juniors and seniors at a high school in order to estimate the proportion of juniors and seniors who plan to go on to college.

• Asking shoppers leaving a grocery store if they think groceries should cost less in order to estimate the proportion of city residents who think groceries cost too much.

A factory manufactures light bulbs. The factory currently has 300 boxes of light bulbs in its warehouse. To test the quality of bulbs, Alex decides to take out a sample of bulbs and test them to see if they work. Which surveying method will give him the least valid results?

• selecting ten boxes randomly, mixing the bulbs of these boxes together and then selecting ten bulbs randomly

• selecting ten boxes randomly and then selecting one bulb randomly from each box

• selecting one bulb randomly from every tenth box

• selecting one box randomly and then selecting all the bulbs from the box

Identify sampling method used: Choose 3 winners of the door prize by randomly drawing tickets out of a bag.

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling

Identify sampling method used: Choose 3 students from each classroom to rate the lunch quality.

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling

Identify sampling method used: Select 5 students from class to receive ice cream by putting all student names in hat & picking out 5 names randomly

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling

Identify sampling method used: Select 6 female students and 7 male students to receive ice cream by putting all the men's names in one hat and all the women's names in a different hat and picking out three names from each hat.

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling

Identify sampling method used: A hockey card collector opens a drawer of sorted cards & selecting a random starting point, takes out every 5th card.

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling

Identify sampling method used: You are conducting a survey of students in a dorm. You choose your sample by knocking on the door of every 10th room

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling

Identify sampling method used: To survey opinions on a possible property tax increase, a reserch firm randomly draws the addresses of 150 homeowners from a public list of all homeowners.

• Convenience Sampling

• Simple Random Sample

• Stratified Sampling

• Systematic Sampling