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 69 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
YES! Correct, THANKS for helping me on my review

chereeb

  • Member
  • Posts: 326
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
ABO and Rh grouping using gelatin centrifugation. The blood sample above is AB negative as indicated ... ABO and Rh grouping using gelatin centrifugation. The blood sample above is AB negative as indicated ...
Example of pre- and posttest Interpretation in an Experiment Example of pre- and posttest Interpretation in an Experiment
What is the [OH-] in a seawater sample if the pH is 8.65? What is the [OH-] in a seawater sample if the pH is 8.65?
What is the estimated age of the archaeological sample What is the estimated age of the archaeological sample
Bacteria with Internal Membranes Bacteria with Internal Membranes
Video: Green alga life cycle Animation

For a complete list of videos, visit our video library