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Author Question: Why is a random sample necessary when conducting a true experiment? a. Without it, internal ... (Read 33 times)

Evvie72

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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


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brittiany.barnes

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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

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Reply 2 on: Jun 19, 2018
Thanks for the timely response, appreciate it

Sarahjh

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Reply 3 on: Yesterday
Wow, this really help

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