Statistical Sampling

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects a random student to start then picks the student in every 5th seat.

• Random

• Systematic

• Voluntary Response

• Stratified

The principal of a high school wants to know if male students or female students are late to school more often. He separates the students by gender, then randomly chooses a group of 30 male students, then a group of 30 female students. This is an example of

• random sampling

• Stratified sampling

• Voluntary-Response

• systematic sampling

To find out what the preferred ice cream flavor is, wait outside an ice cream parlor and ask every 4th person leaving the store to name his or her favorite flavor until you get 25 responses is an example of...

• Voluntary-Response

• Random Sample

• Stratified Sample

• Systematic Sample

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She picks the student in every 5th seat.

• Simple Random

• Systematic Random

• voluntary response

• convenience

Population or Sample? A quality control engineer is curious about the thickness of paint on a car at her factory. She randomly selects 30 points on the car and measures the paint thickness at each of those points.

• Population

• Sample

_______ is the entire group of objects or individuals considered for a survey.

• Sample

• Population

• Random Sample

• Quartile

A survey is carried out at Penn State Altoona to estimate the proportion of all undergraduate students living at home during the current term. Of the 3,838 undergraduate students enrolled at the campus, a random sample of 100 was surveyed. What is the population of the study?

• All the 3,838 undergraduate students enrolled at the campus

• The 100 who were surveyed

• All the students in universities across America

• All students living at home in the current term.

A student wants to know which type of pizza the students at his high school prefer. Which option would give an unbiased, representative sample:

• Asking all the students in the hot lunch line.

• Asking 10 random students from each homeroom.

• Asking every other student who gets off a school bus.

• Asking all the 10th graders.

Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected. 

• systematic

• simple random sample

• convenience

• volunteer response

Why do we randomly select our samples?

• to control every aspect

• reduce bias

• so we don't get the same answers from everyone

• because it is easier to do