I am always confused when I am making null and alternative hypothesis,
I know we intend to formulate null hypothesis with the intention of rejecting it.
But when ever I have a statement i get confused that which is which.
Is there any hard and fast rule that I should keep in mind.
Like in the statements below, I just believed my whims, can you see if I have got any sense of how to make the null and alternative?
It is just practice not home work so you can take your time to reply me.
1.In a highly publicised murder trial it was thought that 25% of all TV viewers watched the proceedings on TV. An analyst felt that this estimate was too small. He selected a random sample of 100 and found 32 of them actually watched the proceedings. The appropriate alternative hypothesis would be
H0 : p=0.25
H1 : p>0.25
2.A member of the Islip Urban Renewal Taskforce claimed that the installation of internal heating facilities in homes had led to the proportion of homes with fireplaces falling below one half.
State the direction of the alternative hypothesis used to test the taskforce claim.
H0: p= 0.5
H1: p not equal to 0.5
Another committee member, who did not originally believe the claim, took a random sample of 84 houses in the area to test the validity of the claim. He found that 33 of them had fireplaces.
H1 p< 0.5
SO do I have any sense of how to make null and alternative?