Researchers constructed an experiment to determine if boys

. Researchers constructed an experiment to determine if boys and girls express aggression differently. Children were brought to the lab and placed into one of two conditions, physical aggression and verbal aggression. The researchers then determined if boys and girls responded differently to the types of aggression. The researchers expected that boys would respond to physical aggression with more negativity (1-10) than boys who experienced verbal aggression, whereas girls would respond to verbal aggression more negatively than girls who experienced physical aggression.

-What is the appropriate test for the researcher to use?

-What is the appropriate critical value?

-If the research obtains a test statistic of ____ , would the researcher retain or reject H₀?

Solution

As there are two different samples here, namely physical agression and verbal agression respectively.

So, we will need to compare proportions in each sample. So a Z test will be used.

The significance level by default is 0.05. So, critical value = 0.05.

The Z value associated with 0.05 level of significance is Z =1.96

So, if the researcher obtain a test statistic of >1.96, the researcher would accept H0.