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a paper claims their experimental data had a large sample size with p-value 0.0078. if paper...

a paper claims their experimental data had a large sample size with p-value 0.0078.
if paper states it used a two-tailed test, what was value of their observed test statistic? (test stat is positive number)
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Answer #1

Solution:

Since two-tailed test,

2P(Z>=z) = 0.0078

P(Z>=z)= 0.0039

From normal probability table;

1-P(Z<=z) = 0.0039

P(Z<=z) = 0.9961

=> P(Z<=2.66 ) = 0.9961

Therefore, the test statistic is 2.66.

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