« previous next »

Author Question: What is the purpose for using a control group in an experiment? a. It provides a baseline to ... (Read 44 times)

jace

  • Hero Member
  • *****
  • Posts: 541
on: Jun 19, 2018
What is the purpose for using a control group in an experiment?
 
  a. It provides a baseline to evaluate the size of the treatment effect.
  b. It minimizes the threat of a confounding variable.
 c. It is necessary to ensure the internal validity of the study.
 d. It is necessary to ensure the external validity of the study.

Question 2

In sampling notation, n refers to the ____.
 
  a. number of cases in the sampling frame
  b. number of cases in the population
 c. number of possible units in the sample
  d. sampling fraction


aadams68

  • Sr. Member
  • ****
  • Posts: 317
Reply #1 on: Jun 19, 2018
Answer to Question 1

a

Answer to Question 2

c


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Genetic control of flower symmetry. Genetic control of flower symmetry.
Implications for infection control Implications for infection control
Mercury experiment Mercury experiment
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
Millikan Oil-Drop Experiment – Experimental Set-Up Millikan Oil-Drop Experiment – Experimental Set-Up
In which experiment was the hormone glucagon used? In which experiment was the hormone glucagon used?
Video: Inflammation

For a complete list of videos, visit our video library