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 93 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!

Hdosisshsbshs

  • Member
  • Posts: 315
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Did you know?

Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.

Methicilli ...
Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.

Hershey and Chase experiment showing that the genetic material of T2 phage is DNA Hershey and Chase experiment showing that the genetic material of T2 phage is DNA
Water-conducting cells of the xylem. Water-conducting cells of the xylem.
true story true story
Sample Exercise Prescription for Weight Training: Intermediate Sample Exercise Prescription for Weight Training: Intermediate
Sample Exercise Prescription for Weight Training: Advanced Sample Exercise Prescription for Weight Training: Advanced
The Meselson–Weigle experiment The Meselson–Weigle experiment
Video: Magnetic resonance imaging (MRI)

For a complete list of videos, visit our video library