Aim: When in copper sulphate solution, iron nail is put, changes take place.Write the observations and precautions in the practical
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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?
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Procedure:
- Clean two iron nails of sufficient size by rubbing them with sand paper so that their colour appears grayish.
- Take sufficient quantity of copper sulphate solution in two different test tubes.
- Clamp the test tubes to differential stands.
- Tie one nail using a thread and hang in one test tube. Tie the other end of the thread to the stand.
- Keep the other nail in a Petri dish for comparison after the experiment.
- Keep the two test tubes undisturbed for about 15 minutes.
- Remove the iron nail immersed in the copper sulphate solution and put it in the Petridish.
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