A news reporter reads about the relationship between acetylcholine and Alzheimer's disease and comments, So basically, Alzheimer's disease (AD) is caused by a lack of acetylcholine. How would you evaluate the reporter's statement?
a) The reporter is incorrect because the evidence links acetylcholine to memory but does not confirm causality of AD
b) The reporter is incorrect because the evidence regarding glutamate deficiency as a cause of AD is stronger than that for acetylcholine.
c) The reporter is correct but the research is still in its infancy and needs to be confirmed.
d) The reporter is correct but the finding only applies to a subtype of AD that has a strong genetic component.
Question 2
Previous research suggests visual-spatial ability varies with gender. You are interested in investigating the effect of an iPhone app to help college students improve their visual spatial ability.
You randomize students to either work with the visual-spatial app or to solve crossword puzzles. You asses their performance on a measure of visual-spatial ability before and after the intervention. Which of the following extraneous variable should you control?
a) Gende
b) Linguistic ability
c) Penmanship skills
d) Age
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