<h3>
Answers: Choice B and Choice C</h3>
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Explanation:
The symbol
or mu represents the population mean, which is a parameter.
The symbol
or sigma represents the population standard deviation, which is also a parameter. The same goes for the symbol p, without any hat on top, as it is the population proportion.
If something represents a population data item, then it's automatically a parameter. It might help to think both words "population" and "parameter" start with the letter P.
Based on those previous paragraphs, we can rule out choices A, D and E. Those three items are parameters. This leaves <u>choices B and C</u> as our final answers.
or xbar is a sample statistic, and it represents an estimate of the population mean. Similarly,
or p-hat is the sample proportion and it represents an estimate of the population proportion. These are considered unbiased estimators.
Another example of an unbiased estimator is the variable s which represents the sample standard deviation and it estimates the value of sigma. All of these estimators have one thing in common: they are based on a sample, which in turn tries to predict what the corresponding population value is. In other words, the statistic's job is to estimate the parameter.
Below is a reference table for all of the items mentioned.
The right answers is option c
The heat absorbed when 2.8 mol NH₄NO₃ is dissolved in water is 71.96 kJ.
<h3>What is heat?</h3>
Heat is the transportation of energy to or from a thermodynamic system.
By the formula of heat
![\rm (n) \times (delta\;Hrxn) = (qrxn)](https://tex.z-dn.net/?f=%5Crm%20%28n%29%20%5Ctimes%20%28delta%5C%3BHrxn%29%20%3D%20%28qrxn%29)
Where n = moles
Delta Hrxn is molar heat
q = heat
Putting the values in the equation
![\rm qrxn = (2.8 mol) \times(25.7 kJ/mol) = 71.96 kJ](https://tex.z-dn.net/?f=%5Crm%20qrxn%20%3D%20%282.8%20mol%29%20%5Ctimes%2825.7%20kJ%2Fmol%29%20%3D%2071.96%20kJ)
Thus, the heat absorbed when 2.8 mol NH₄NO₃ is dissolved in water is 71.96 kJ.
Learn more about heat
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Answer:
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