I need help with these questions can you help me with the answers?

6.) When I set my alarm clock to ring at 6:30, it rings 10 minutes late every day. My clock is (a) biased. (b) invalid. (c) imprecise. (d) unreliable. 7.) An ad for a new headache remedy says that it "reduces headache pain by 300%." What does this mean? (a) It means that there is 3 times as much pain before using the treatment as there is after using it. (b) It means there is only seven-tenths as much pain after using the treatment, because 300/1000 = 0.3, or three-tenths. (c) It's nonsense, because removing 100 percent of the pain already removes all of it. (d) It's nonsense, because pain is not a numerical variable, so percents don't make sense. 8.) A stats teacher wants to know if adolescents can be fooled by a certain misleading statistic. She recruits 50 students from her classes and finds that 42 of them are fooled by the statistic. The population in this study is (a) the 42 students who were fooled. (b) the 50 students who served as subjects. (c) all students in the teacher's classes. d) all adolescents. 9.) The teacher in the previous question carried out: (a) a census (b) an observational study c) an experiment d) a sample survey 10.) A new instrument is supposed to measure the sugar content of a substance. It is used to measure the sugar content of five test samples, all of which are known to be exactly 16% sugar The numbers given by the machine on these five test samples are 5%, 3%, 28%, 16%, and 25%. Based on these measurements, one can conclude that the new instrument (a) is biased. (b) is not reliable. (c) is not valid. (d) is confounded