A Market Research Firm Is Conducting a Study to Determine $\alpha$

A market research firm is conducting a study to determine which of two package designs for a liquid soap product potential customers prefer, the current design (A) or a new design (B). A sample of 20 potential customers is taken. The results follow.
Use Excel to conduct the appropriate hypothesis test at $\alpha$ = .05 to determine if the data indicate that there is a difference in preference between the two designs.