Check check ;)

The variable measured in an experiment is ____

• the independent variable

• a null hypothesis

• the dependent variable

• an alternative hypothesis

An extraneous variable:

• is deliberately changed in an experiment

• is an uncontrolled variable that could affect the DV

• Is measured in an experiment

• can only be found in experiments

Selecting participants who just happen to be available is called ____

• opportunity sampling

• volunteer sampling

• random sampling

• stratified sampling

A laboratory experiment ____ compared to natural experiment

• Is easier to replicate

• is less controlled

• has higher ecological validity

The independent variable in  study is ____

• a variable controlled by researcher

• a variable manipulated by the researcher

• a variable measured by researcher

A student plans to investigate the effects of practice on IQ test performance. Some participants are given two practice tests prior to the IQ test whereas others do the test beforehand. The dependent variable in this study is:

• The participants
• The effects of practice
• IQ test performance before the study
• IQ test performance at the end of the study

Which of the following is not a weakness of repeated measures in experiment?

• order effect

• practice effect

• fatigue effect

• primacy effect

One advantage of conducting a matched pairs design is ___

• fewer participants are needed in the study

• researchers can control some participant variables

• participants can participate in more levels of experiments

Which of the following is a random sample?

• Names drawn from a hat
• Asking people if they would like to take part
• Every 10th name in the register
• Taking whoever happens to be there

The higher the self-esteem, the higher the grades of students. The statement above shows that there is a ____ between variables.

• positive correlation

• zero correlation

• negative correlation