The answer to this question is C
Since we wish to test the null hypothesis that gender and personal goal are independent. Under the said null hypothesis, the expected number of boys that would select "be good at sports" would be the same more or less with the girls that would select "be good at sports". The difference in their means would be set to zero for this null hypothesis.
<span>Interstitial diffusion occurs more rapidly in metal alloys because these atoms are smaller, and therefore they are more able to move and vibrate as compared to atoms that are larger and less able to migrate.</span>
Molecules that have the same chemical formula but have different molecular structures are: Isomers.
