U1_August 19 Practice

Interview the first 30 students who enter the school in the morning. 

• simple random
• voluntary response
• systematic
• convenience

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?

• for control
• reduce bias
• so we don't get the same answers from everyone
• to eliminate confounding results

Identify the sampling design: SCPS wants to survey its employees.  They pick 4 schools from the county and survey every single employee in each of the 4 buildings.

• cluster
• volunteer
• systematic
• simple random

Identify the sampling design: Student government randomly samples 25 students of each of the four classes.

• stratified
• volunteer
• systematic
• simple random

One group of subjects was given an herbal supplement and another group was given a placebo. After one year, the number of illnesses each group had was compared.

• Observational Study

• Experiment

A professor finds that people who are obese have higher cholesterol levels than those who are not obese.

• Observational Study

• Experiment

Which of the following are qualitative data

• People's heights

• People's home town

• The distance people travel to work/school

There are 25 liters of water in the buckets.

• quantitative

• qualitative

A school principal wants to offer an after-school club setting. She decided to survey 300 students about this. Which word best describes the group of 300 students?

• Population

• Sample

• Census

• Prediction