To determine the organic material in a dried lake bed the percent carbon by mass is measured at two different locations. In order to compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. For each location, calculate the standard deviation.
Location 1 (% C) Location 2 (% C)
1 70.40 70.10
2 70.30 70.90
3 70.30 70.20
4 70.40 70.70
5 70.30 70.40
Location 1 Location 2
Number Number
0.055 0.34
a. What is the calculated F value for comparing the standard deviations?
b. Are the two standard deviations for the locations significantly different at the 95% confidence level?
c. What is the calculated t value used to compare the means of these two location?

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.