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In a random sample of 80 ears of corn, farmer Carl finds that 11 of them have worms. Carl claims that less than 20% of all his corn has worms. Test this claim at the 0.05 significance level.

(a) What is the test statistic?
zp̂ =

(b) What is the P-value of the test statistic?
P-value =

(c) What is the critical value of z?
zα =

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