Please help me only if you really know how to solve it as I am stuck and I cannot solve these questions. Dont give me random answers please. You can use any software to solve it if it's easier ( we use R). If I am satisfied, i will also make sure you are satisfied too.

Link to textbook if needed with the content: https://drive.google.com/file/d/1ptM7Pzw8e364cZpwdQXU30GVhrQc1AZ7/view?usp=sharing

Questions:

Question Suppose we are interested in calculating a 90% confidence interval for the mean of a normally distributed population. We've drawn a sample of 8 observations from this population, and found a sample mean of 323.3 and a sample standard deviation of 43.0. What is the appropriate lower endpoint of the 90% interval for mu? (eg. If the interval is {3.7119674}, give 3.712 as your response.) (Give your response to at least 3 decimal places. Give only your numeric response, and no extra characters or symbols.) Your Answer: \\ . Your Answer QUESIIU Suppose we wish to estimate the population proportion of adults in a large geographical region who own a car. In a random sample of 1500 adults in this region, 438 own a car. If we wish to construct a 99% confidence interval for the true proportion of adults in this region who own a car, what is the appropriate margin of error? (Give your numeric response to at least 3 decimal places. Give only your numeric response, and not any extra characters or symbols.) Your Answer: \\ . Your