Way to reduce bias

Question 1

Which types of bias is being reduced with Randomization?

Answer 1

1. Selection bias
2. Instrumentation
3. History
4. Mortality

Question 2

Which types of bias is being reduced with Control Group?

Answer 2

1. History
2. Maturation
3. Instrumentation
4. Statistical Regression

Question 3

Which types of bias is being reduced with Extra Group?

Answer 3

1. Testing
2. Statistical Regression

Question 4

Which types of bias is being reduced with Statistical Control?

Answer 4

1. History
2. Selection bias