Univariate statistical tests show
that coffee (black coffee only) and the total are significantly higher in the card/cash group
than in the cash group and weakly significantly higher for beer (Wilcoxon-Mann-Whitney
tests (WMW), two-sided, n=53, beer: p=0.086, expensive coffee: p=0.173; coffee: p=0.023,
total: p=0.035). These findings indicate that payment form does matter for consumer
valuations of products.