Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
Did you wash your hands with soap before eating? You've undoubtedly been asked that question a few times in your life. Mom knows that washing with soap eliminates most of the germs you've managed to collect on your hands. Or does it? A student decided to investigate just how effective washing with soap is in eliminating bacteria. To do this she measured the bacterial count after using one of four different methods - washing with water only, washing with regular soap, washing with antibacterial soap, and spraying hands with antibacterial spray (containing 65% ethanol as an active ingredient) . SPSS output of the Kruskal-Wallis test is provided below.
-What is the null hypothesis in this situation?

A) The four population mean bacterial counts are equal for the four populations.
B) The four population mean bacterial counts are not equal for the four populations.
C) The four population median bacterial counts are equal for the four populations.
D) The four population median bacterial counts are not equal for the four populations.