Help please !

5- Suppose that you have a population with p: 10 and o: 2. How do you estimate the mean of this population? 6- IWhich one do you prefer if you had to choose only one, and why? - An unbiased but inefcient estimator or a biased but efcient estimator? ?'- To estimate the mean of a population, what do you do if you do not know the distribution of the population? [you should explain what theorem you use and how this theorem is helpful]. 8- Suppose that you have two populations: - Population A: you do not know the distribution, mean, and the variance of the population. - Population B: you do not know the distribution and the mean of the population. But you know the variance of the population. Now you want to build a $69!] confidence level interval for the mean of each population separately by sampling. What is the difference between the methods you use for each population? 9- The dean of the school wants to know the proportion of students in the school who prefer online classes for the next semester. How do you conduct a research to estimate this proportion by sampling {suppose that you can take only one sample of size n which is smaller than the population size N, and also suppose that a 5690 percent confidence interval is fine}. - You should explain all steps you take including how you make decision about sample size, what question you ask from the sample, the estimator you choose and the reason for that, how you calculate this estimator, and how you build a confidence interval for the parameter based on this estimator