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A survey asked Democrats, Republicans, and independent voters what the most important message is to send to Congress. The most popular response for all three groups was to "focus on the economy." The number of respondents, the messages they want sent, and their party affiliations are shown in the accompanying table.

Message Democrat Republican Independent
Focus on Economy 54 57 65
Other 93 120 59
Total 147 177 124

a. Using a = 0.05, perform a chi-square test to determine if the proportion of voters who responded "focus on the economy" differs among the three groups of voters.