What would you like to do?
Show that in simple random sampling the sample variance is an unbiased estimator of population variance?
It is a biased estimator. S.R.S leads to a biased sample variance but i.i.d random sampling leads to a unbiased sample variance.
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If you take a sample to a pool shop it takes less than a minute.
5 panel, NO 10 panel, yes
A scientific test you do on water similar to a chemical test
There is a thing called heavy water. It is pure water that has a deuterium in it known as D20 instead of H20. It is pure but does not have the same mass.
I would think only if someone orders it and pays for it. Why not call a Dr's office and ask them what all is tested in a general phyical urine sample? Ask if it includes Diabe…tis, thyroid etc. Find out if testing for other things like Choresterol or chemicals from exposure at work cost extra. They test for standard things. Extra things only if someone orders it and pays for it.
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no, because pure water has an even number of H+ ions and OH- ions that have all bonded to form H2O.
test for E.coli etc....
You could distill the water from the lemon drink and condense the water vapor and collect the water in a container.
Evaporate the water, leaving the ink behind.
Boil it until the water is gone. You will have a deposit of salts left behind.
Only refined water (by distillation, ion exchangers, reverseosmosis etc.) may be pure.
You could test its melting point, since pure glucose has a known melting point of 146 o C.