Question

* I just wanted to know if I'm setting up the Ho and Ha correctly.


An herbal supplement is advertised as producing an increase in strength and stamina.
Sample of n=36 adults is obtained and each person is told to take the regulary daily dose of the herb for 30 days.

At the end of the 30days each person is tested on a treadmill task for which average, age adujected score is mu=15.

The people in the sample proudce a mean socre of M=16.9 with SS=1260


* I just wanted to know if I'm setting up the Ho and Ha correctly.

-Are these data sufficient enough to conclude that the herb has a statistically significant effects using a 2 tailed test with an alpha level of .05?


Ho: mu =15
Ha: mu does NOT equal 15

How would I would a set up the Ho and Ha for a ONE-TAILED test?

Would it be like this?

Ho: mu>15
Ha: mu<15



Thanks

Answer 1

For two-tailed test:

Ho: μ = 15
Ha: μ ≠ 15

Since the sample value is greater than μ, for one-tailed test:

Ho: μ = 15
Ha: μ > 15

I hope this helps. Thanks for asking.