Thirty infants were sampled to discern whether children with

Thirty infants were sampled to discern whether children with higher crying counts tend to have higher IQs. What is the P-value that would be used to test the hypothesis H₀:? = 0 versus H_a: ? > 0, using t = 3.07?

Solution

The degree of freedom =n-1=30-1=29

It is a right-tailed test.

So the p-value= P(t with df=29>3.07) =0.0023 (from student t table)