Figure 9.50 shows the results of a study about the annual revenue from different household types in a supermarket chain. What was studied and how are the results to be interpreted?

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Household typ Annual revenues Type 1 Type 2 Annual revenues Equal variances assumed N Group Statistics Mean 772.7131 778.2458 178 184 Equal variances not assumed Std. Deviation F 81.231 Levene's Test for Equality of Variances Independent Samples Test Sig. 15.87738 29.90867 .000 t -2.19 Std. Error Mean 1.19006 2.20490 df 360 -2.21 280.536 t-test for Equality of Means Sig. (2- tailed) 029 Mean Difference Std. Error -5.53277 .028 -5.53277 95% Confidence Interval of the Difference Difference Lower 2.52900 -10.50623 Upper -55930 2.50556 -10.46485 -.60069