Question

What volume of H2 has is produced at normal temperature and pressure, when 25g of magnesium reacts with water?​

Answer 1

Answer:

a hospital based cross-sectional study, it is planned to estimate the mean D-dimer level among COVID-19 patients. From previous literature, the standard deviation was found to be 200 ng/mL. If the researchers want to estimate the mean with a 50 ng/mL precision and 95% significance level, what is the minimum sample size required?