Question

when is it appropriate to do a one-tailed test when performing a T-test?

a) when you want to make it easier to find a significant result

b) when you want to make it more difficult to find a significant result

c) when you have no hypothesis as to whether or not the distribution that you are testing is greater than or less than the standard score

d) when you do have a hypothesis as to whether or not the distribution that you are testing is greater than or less than the standard score

Answer 1

we do one tailed test when hypothesis is gives in one of the two cases

(1)

H0:  =k vs

H1:>k where k is a constent and is a population parameter. ( this is right taied test)

(2)

H0:  =k vs

H1:<k where k is a constent and is a population parameter. ( this is left taied test)

these two case are one tailed case.

so from the H1 of both case it is clear H1 decides whether test is one tailes or not.

so D ooption is correct as here K (given above) is treated as standard score

so Ans is:-

when you do have a hypothesis as to whether or not the distribution that you are testing is greater than or less than the standard score