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(1) The incidence of violonce in television programs is well documented. The most extensive studies have been carried out by Gerbner and his fellow scholars, analyzing samples of prime-time and weekend daytime television for all the major American networks each year after 1967.

Which does 'analyzing' refer to; '
the most extensive studies' or 'Gerbner and his fellow scholars'?

(2)In what ways, if at all, do violent scenes influence the audience? F.S. Anderson collected the findings of sixty-seven studies conducted over the twenty years from 1956 to 1976 investigating the influence of TV violence on tendencies toward aggression among children.

Which does 'investigating' refer to; '
F.S. Anderson' or 'sixty-seven studies'?
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I'd say in both cases they refer to the studies.
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Hi,

(1) The incidence of violonce in television programs is well documented. The most extensive studies have been carried out by Gerbner and his fellow scholars, analyzing samples of prime-time and weekend daytime television for all the major American networks each year after 1967.


Just looking at it from a grammatical point of view, it seems to me that analyzing qualifies Gerbner and his fellow scholars. Semantically, it probably makes little difference either way.

I agree with Nona about the second one.

Best wishes, Clive
Thank you, people!