12. An advertisement for a headache remedy claims that 90% or more of headache sufferers get relief if they use the remedy. To test this claim, a truth in advertising agency is considering a suit for false advertising and obtains a sample of 100 individuals, which shows that 88 indicate that the remedy gave them relief. Test the advertisement claim. (Use a= 0.05, and z =1.65) (a) State the null (Ho) and alternative (H,) hypotheses. (b) Carry out the test and give your conclusion