I have two conditions for this dataset: 1. I have a total sample size, overall mean of reduction rate for all patients (one number), and interquartile range; 2. I have a total sample size and individual reduction rate.

My question is how to compute the standard error for these two conditions? I am suddenly confused about the equation. For the first condition, I thought I could compute the standard error simply by using SQRT(p*(1-p)/n), but I am not sure if this is suitable for my scenario. Could anyone help me with it? Thank you so much!