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 α = .05, test for a significant difference in the preference for the candidates.
Definitions:
Summary Close
A sales technique where the seller summarizes the main points of the presentation before asking for the sale.
Alternative Close
A sales technique in which the seller presents multiple options to the prospect, making it easier for them to make a decision without feeling pressured.
Assumptive Close
A sales technique where the seller assumes that the customer has already decided to buy and wraps up the sale.
Alternative Close
A sales technique where the salesperson presents the prospect with two final options, making it easier to make a purchase decision.
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