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?

What is the mass of 0.46 mil of mgcl2

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

Which of the following is true about a carbonated soft drink? . the carbon dioxide is the solvent, and water is the solute.. the water is the solution, and carbon dioxide is the solvent.. the carbon dioxide is the solution, and the water is the solvent.. the water is the solvent, and the carbon dioxide is the solute.. .