The p-value for study B is 0.98.
With the same set of data, two studies were conducted.
Study A was a two-sided test while study B was a one-sided test.
The p-value of the test in study A is 0.040.
If the test statistic from your sample has a negative value, the p-value for a two-sided test is equal to twice the p-value for the lower-tailed p-value. If the test statistic from your sample has a positive value, the p-value is two times that of the upper-tailed p-value.
So, in conclusion:
The one-tail p-value equals one minus half the two-tailed value.
The two-tail p-value is twice the one-tail p-value.
As study A is a two-sided test with p-value = 0.04.
The p-value of study B will be:
p = 1 - ( 1/2 ) × 0.04
p = 1 - 0.02
p = 0.98
The p-value for study B is 0.8.
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