A comparative study of organic and conventionally grown produce was checked for the presence of E. coli. Results are summarized below. Is there a significant difference in the proportion of E. coli in organic vs. conventionally grown produce? Test at ? = .10.
Sample Size
E. coli Prevalence
Organic250
3
Conventional500
20
What will be an ideal response?
H0: p1 - p2 = 0Ha: p1 - p2? 0z = -2.10, p-value = .036; reject H0; yes, there is a significant difference in the proportion of E. coli in organic vs. conventional produce.
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