How to indentify the question for chapter hypothesis testing?

QUESTION 1 A researcher claims that the average salary of assistant professors is more than RM 42000. A sample of 30 assistance professors has mean salary of RM 43260. Test the claim at 5% level of significance that assistant professors earn more than RM42000 a year. The standard deviation of the population is RM5230. QUESTION 2 An advertisement for a certain brand of cigarettes claimed that on average there is less than 18mg of nicotine per cigarettes. A test of 12 cigarettes gave a sample mean of 19.1. assuming variance is 4, test the claim with a significance level of a=0.05. QUESTION 3 The mean lifetime for a sample of 125 lamps is 1205 hours with standard deviation 105 hours. However, the company claims that their lamps average lifetime is difference from 1300 hours. Test the claim at 1% level of significance