Given a 95 confidence interval for p1p2 as 098 078 What can

Given a 95% confidence interval for p1-p2 as (-0.98, -0.78). What can be concluded?

nothing

p1>p2

p1=p2

p1<p2

Solution

Since confidence interbal does not contain zero so option C is false.

Since confidence interbal does not contain only negative values so option B is false.

Since confidence interbal contains only negative values so we can conclude option D.