I need help with with 5,6,7 having a hard time interrupting the questions

arthritis. The researcher randomly selects 43 men with rheumatoid arthritis and measured the mean HCT level of 33.8 pg/mL. Assume that HCT for individuals with rheumatoid arthritis follows a normal distribution with standard deviation o = 23.6 pg/mL. 1. For a 95% level of confidence what is the appropriate critical value Z*that needs to be used to calculate the margin of error? Determine the value of the critical value using a table or preferred technological tool. 2. Determine the margin of error for HCT levels. 3. Create a 95% confidence interval for the population mean HCT. 4. Explain in detail what the 95% Confidence Interval for the mean HCT represents within5. What is the effect on the interval width if we decreased or increase the confidence level to 90% or 99% respectively? (Hint, create the intervals) 6. Describe the effect on your confidence interval if you increase or decrease the sample size. 7. Describe a situation where a researcher would want to use a larger confidence level than 95% and a situation where a smaller confidence level would be preferred