Hello, I need help solving this, preferably on paper

9. For the following: xbar=35, n=25, 0=4 a) Find 95% confidence interval for the population mean b) Find the margin of error c) Express the endpoints of the confidence interval in terms of the point estimate and the margin error. 10. Suppose that we obtained data by taking a random sample from a population and that you intend to find a confidence interval for the population mean . Which confidence level, 95% or 99% will result in confidence interval giving a more accurate estimate of u? Show all work how you got the result)