How do randomization and random sampling differ?

Which of the following is a requirement for the pretest in an experiment?

Random assignment eliminates systematic bias.

Which of the following experiments is used when random assignment to a control or experimental group is not possible, impractical, or unethical?

Dr. Lee is hired as a consultant to design a survey to measure attitudes toward the death penalty. She must identify in the fastest possible time support for the death penalty that can be generalized to the general population. Which survey method should she use?

Multiple pretest and posttest measures are valuable in before-and-after designs because they decrease the possibility of internal invalidity due to:

Which of the following are responsible for 80% of the increase in meat and egg bird performance over the past 50+ years in the US poultry industry?

Pasture-based dairies are forage-based unlike free-stall and tie-stall dairies.

Table egg farms make up less than 5% of the poultry farms in the US.

Which of the following are responsible for 80% of the increase in meat and egg bird performance over the past 50+ years in the US poultry industry?