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Describe what is means when a piece of research is criticised for having low external validity ?

Describe what ecological validity means?

When might a research study have low population validity?

What is a pilot study?

How can extraneous variables be controlled.. e.g. order effects?

What is a null hypothesis?

Give an advantage of using a repeated measures design..

What two ways would you overcome using deception in a study

What is a scattergram?

What does the standard deviation show?