Video games A headline in a local newspaper announced Video game playing can lead to better spatial reasoning abilities.
The article reported that a study found statistically significant differences between teens who play video games and teens who do not, with teens who play video games testing better in spatial reasoning. Do you think the headline was appropriate? Explain.
Question 2
A researcher wants to compare the effect of a new type of shampoo on hair condition. The researcher believes that men and women may react to the shampoo differently.
Additionally, the researcher believes that the shampoo will react differently on hair that is dyed. The subjects are split into four groups: men who dye their hair; men who do not dye their hair; women who dye their hair; women who do not dye their hair. Subjects in each group are randomly assigned to the new shampoo and the old shampoo. This experiment
A) has three factors (shampoo type, gender, whether hair is dyed).
B) has two factors (shampoo type and whether hair is dyed) blocked by gender
C) is completely randomized.
D) has one factor (shampoo type), blocked by gender and whether hair is dyed.
E) has two factors (gender and whether hair is dyed) blocked by shampoo type.
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