The following data show the preference of 20 people for a candidate to a public office. A "+" indicates a preference for the Democratic candidate, and a "-" indicates a preference for the Republican candidate. With $\alpha$ = 0.05, test for a significant difference in the preference for the candidates.

Question

The following data show the preference of 20 people for a candidate to a public office. A "+" indicates a preference for the Democratic candidate, and a "-" indicates a preference for the Republican candidate.  With $\alpha$ = 0.05, test for a significant difference in the preference for the candidates.

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The Answer of The following data show the preference of 20 people for a candidate to a public office. A "+" indicates a preference for the Democratic candidate, and a "-" indicates a preference for the Republican candidate.  With $\alpha$ = 0.05, test for a significant difference in the preference for the candidates.

The Following Data Show the Preference of 20 People for a Candidate