11 - Statistical Methods

A gaming website wanted to find out which console its visitors owned. Which choice BEST represents the population in this situation?

• Visitors with an 'e' in their user name.

• Visitors to the 3DS section.

• Visitors over 22.

• All the website visitors.

A survey company was trying to see if people in a state thought the pollution was too high. Which choice BEST represents the population to be surveyed?

• A selection of people from each neighborhood in the state.

• A selection of people who live in small towns.

• Every person in the state.

• A selection of people who live in dirty neighborhoods.

A toy store owner is tracking how much kids spend each month on toys. Which choice BEST represents a sample?

• All of the kids who buy toys.

• 275 rich kids

• 200 random kids of all ages

• 292 boys ages 7-15

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She randomly selects 5 students.

• Convenience Sampling
• Systematic Sample
• Stratified Sample
• Random 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 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

To avoid working late, the quality control manager inspects the last 10 items produced that day.

• Convenience

• Random

• Self Selected

• Systematic

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

• $77.78

• $4.31

• $188.78

• $494.97