please help with these questions

In October 1945, the Gallup organization asked 1 487 randomly sampled Americans, "do you think we can develop a way to protect ourselves from atomic bombs in case other countries tried to use them against us?" with 788 responding yes. Did a majority of Americans feel the United States could develop a way to protect itself from atomic bombs in 1945? Use the a = 0.05 level of significance.According to the National Sleep Foundation, children between the ages of 6 and I I years should get 10 hours of sleep each night. In a survey of 56 parents of 6 to I I year olds, it was found that the mean number of hours the children slept was 8.9 with a standard deviation of 3.2. Does the sample data suggest that 6 to I I year olds are sleeping less than the required amount of time each night? Use the 0.01 level of significance.What type of test would be most appropriate for the following study? Researchers measured regular testosterone levels in a random sample of athletes and then measured testosterone levels prior to an athletic event. They wanted to know whether testosterone levels increase prior to athletic events