An import threshold for mercury in crayfish is 9 parts per, Ask an Expert

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An import threshold for mercury in crayfish is 9 parts per billion (ppb). A study obtained a random sample of 120 crayfish from a large lake. Of these, 24 have levels of mercury that exceeded 9 ppb. Past research had shown that 25% of the crayfish had levels that exceed 9 ppb. Based on new water standards for manufacturers in the region, they wanted to see if there was a change in contamination in crayfish. What are the appropriate null and alternative hypotheses? (NE means not equal.)

A. Ho: p = .25 and Ha: p > .25

B. Ho: p = .25 and Ha: p NE .25

C. Ho: p = .25 and Ha: p > .20

D. Ho: p = .25 and Ha: p < .25

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91010340

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