This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why is a random sample necessary when conducting a true experiment? a. Without it, internal ... (Read 76 times)

Evvie72

  • Hero Member
  • *****
  • Posts: 519
on: Jun 19, 2018
Why is a random sample necessary when conducting a true experiment?
 
  a. Without it, internal validity and external validity are compromised.
  b. Without it the experiment can be internally valid, but will not have external validity.
  c. Without it, the reliability and validity of the experiment are compromised.
  d. It is not necessary to have a random sample when conducting an experiment.

Question 2

Descriptive statistics are used to _________.
 
  a. calculate the mean and standard deviation of a sample
  b. calculate the mean and standard deviation of a population
  c. graph a distribution of raw scores
  d. all of these


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

brittiany.barnes

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Jun 19, 2018
Answer to Question 1

D
Experiments investigate relationships between variables. It is not necessary to have random samples to do this.

Answer to Question 2

D


Evvie72

  • Member
  • Posts: 519
Reply 2 on: Jun 19, 2018
Gracias!

Viet Thy

  • Member
  • Posts: 329
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

People about to have surgery must tell their health care providers about all supplements they take.

Chuckwalla body lengths at the end of a laboratory rearing experiment Chuckwalla body lengths at the end of a laboratory rearing experiment
Blood glucose measurement. A postprandial test may be self-administered. (a) A lance pierces the ski Blood glucose measurement. A postprandial test may be self-administered. (a) A lance pierces the ski
Mercury experiment Mercury experiment
Sample root cause analysis: Duplicate dose of a narcotic analgesic. Sample root cause analysis: Duplicate dose of a narcotic analgesic.
Gas molecules have no bonds to other molecules and move in random motion. Gas molecules have no bonds to other molecules and move in random motion.
The Taylor–Woods–Hughes experiment The Taylor–Woods–Hughes experiment
Video: Major Elements in Biological Molecules: Lipids

For a complete list of videos, visit our video library