Do consumers spend more on a trip to Store A or Store B? Suppose researchers interested in this question collected a systematic sample from 83 Store A customers and Store A Store B 79 Store B customers by asking customers for their purchase amount as they left the stores. The data collected is summarized by the accompanying table. Suppose researchers decide to test the hypothesis that the means are equal. The degrees of freedom formula gives 160.00 df. Test the null hypothesis at a = 0.05. 20 OB. HO: HA - HB # 0 HA HA - HB = 0 O C. Ho: HA - HB = 0 HA HA - HB > 0 O D. Ho: HA - HB = 0 HA HA - HB