1)The word "data" is plural, so we say thees data show, the data support.
2) Affect vs. effect. Affect is verb, while effect is noun in general. Exception: "to effect a change".
3) Campared to vs compared with
Campared to = to point out similarities between different thing
Campare with = point differences between similar things. ()
4) that vs. which
that is the restrictive defining pronoun
which is the nonrestictive (non-define) pronoun.
Is your clause essential? If so, use that. Otherwise use the which. Removing which clause will not change the meaning of a centence.