Yes you are correct it is
It is important because if the sample size is smaller, outliers could skew the data more than if it was large.
Explanation:
option A skeleton system is correct option
hope this helps you !
Answer: a) Temperature of 
b) 
c) dehydrating agent
Explanation:
Ethanol is heated with an excess of concentrated sulfuric acid at a temperature of 170°C to produce ethene.
The balanced chemical reaction is:

Here concentrated sulfuric acid removes a water molecule from ethanol and thus acts as a dehydrating agent.