In a study18 comparing various drink types (alcohol, energy drink, alcohol plus energy, decaffeinated soda) on college students’ desire for additional drinks after various lengths of time, the soda drink had the least effect. In one analysis for the soda, the authors reported that desire ratings were significantly higher at 10 minutes compared with the baseline (t = 2.47, df = 19,P = 0.011) but not significantly different for the other time points (P-values >

0.32). Explain why these analyses used statistical methods for dependent samples, identify the sample size, and interpret the P-value for the significant result.