An import threshold for mercury in crayfish is 9 parts per billion (ppb). A stud

Question

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. The researchers wanted to see if there was a change in contamination in crayfish. The test statistic for this problem is -1.26. What is the p-value for this tests statistic? (use 4 decimal places)? O.1038 O .2076 .0500 O .1000

Explanation / Answer

Given:

The researcher wanted to see if there was a change in contaminatiom in crayfish.

So, this is a two sided test.

Test statistic is:

t = - 1.26.

Table of Area Under Standard Normal Curve gives area = 0.3962

So,

p-value = (0.5 - 0.3962) X 2 = 0.2076

So,

Correct option:

0.2076

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