A researcher measures human calcitonin (HCT) levels in men with rheumatoid arthritis. The researcher randomly selects 26 men with rheumatoid arthritis and measures the samplemean HCT level of 33.8 pg/mL and a sample standard deviation of 10.4 pg/mL. Assume thatHCT for individuals with rheumatoid arthritis follows a normal distribution. Construct a 92%confidence interval for the mean HCT level in men with rheumatoid arthritis. Be sure to: State the value for α. State whether you should use z or t and find the appropriate value. State the parameter your confidence interval is for. Find the confidence interval (to 2 decimals). Write a verbal interpretation of your confidence interval. (For example: We are xx%confident...)
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