Statistics: Please answer

Question

A researcher hypothesizes that children from the South weigh less (because they spend more time outside) than the national average. Identify H0 and Ha. Is this a one- or two-tailed test?

Answer 1

Ho would be that the children from the south weigh the same: μ = population average

Ha would be that the children from the south weigh less μ < population average

Since the question is asking about "less than" this is an example of a one tailed test.

I hope that helps