Two styles of water filter were being considered for drinking water in remote rural villages: one with a thick layer of sand and one with a thin layer of sand. It was predicted that the thicker filter would be most effective at reducing E. coli counts (number of bacteria per 100 mL water). See water filters.jmp.

a. Does this dataset meet the t robustness criteria? Yeso and explain your reasoning.

C. E. coli in drinking water can cause illness and sometimes even death among the very young, very old, or immunocompromised persons. Would the 1%, 5%, or 10% significance level be most appropriate here? Explain.

d. Complete steps 3-7 of the hypothesis test

ater filters D E coli Source Filter type (count ... thick 18 2 thick 0 3 | thick 77 4 thick 4 5 thick 263 6 thick 75 7 thick 5 8 thick 0 9 thick 6.7 10 thick 33 11 thick 12 thick 10 Columns (2/1) 13 thick 0 14 thick Filter type E coli (c... 100 mL) 15 thin 200 16 thin 170 17 thin 18 thin 19 thin 33