In a Poll Taken 3 Months Ago, the Preferences of Voters

Short Answer

In a poll taken 3 months ago, the preferences of voters among three candidates running for mayor were: Smith = 45%, Jones = 35%, and Thompson = 20%. Candidate Thompson's election committee has just polled 120 likely voters at random and found that 40 said that they would vote for Smith, 35 for Jones and 45 for Thompson. Has the voter's preference changed since the earlier poll [use ( $\alpha$ = .05)]?