Question

I am having a difficult time working with the alternative and null hypothesis. Can you assist me with a simple way to solve and use these two. Maybe an example if possible.

Answer 1

Ans:

Two tailed test:

Reports say that the mean birth weight of babies of European heritage is 3.5 kg. Marta wants to perform a significance test to see if this holds true in her nation. She takes a random sample of babies and observes a mean birth weight of x-bar=3.43 kg.

Left tailed test:

Now,say if Marta wants to perform a significance test to see if mean birth weight is less than 3.5.

Right tailed test:

Now,say if Marta wants to perform a significance test to see if mean birth weight is greater than 3.5.