Which of the following statements is not true?

[color=#333333][font=TimesNewRoman]A researcher conducts an experiment that tests the hypothesis that ‘anxiety has an adverse effect on students’ exam performance’. Which of the following statements is true? [/font][/color]

[color=#333333][font=TimesNewRoman]An experimenter conducts a study in which she wants to look at the effects of altitude on psychological well-being. To do this she randomly allocates people to two groups and takes one group up in a plane to a height of 1000 metres and leaves the other group in the airport terminal as a control group. When the plane is in the air she seeks to establish the psychological well-being of both groups. Which of the following is a potential confound [extraneous variable], threatening the internal validity of the study? [/font][/color]

[color=#333333][font=TimesNewRoman]What distinguishes the experimental method from the quasi-experimental method?[/font][/color]

[color=#333333][font=TimesNewRoman]An experimenter, Tom, conducts an experiment to see whether accuracy of responding and reaction time are affected by consumption of alcohol. To do this, Tom conducts a study in which students at university A react to pairs of symbols by saying ‘same’ or ‘different’ after consuming two glasses of water and students at university B react to pairs of symbols by saying ‘same’ or ‘different’ after consuming two glasses of wine. Tom predicts that reaction times will be slower and that there will be more errors in the responses of students who have consumed alcohol. Which of the following statements is [/font][/color][i][color=#333333][font=TimesNewRoman]not[/font][/color][/i][color=#333333][font=TimesNewRoman] true? [/font][/color]