To determine the organic material in a dried lake bed, the percent carbon by mass is Sample Location 1 Location 2 measured at two different locations. To compare the means of the two different locations, % C) % C it must first be determined whether the standard deviations of the two locations 1 70.40 70.10 are different. 2 70.30 70.90 For each location, calculate the standard deviation and report it with two 70.30 70.30 significant figures. 4 70.40 0.80 S 70.30 70.40 location 1 standard deviation: location 2 standard deviation: What is the calculated F value for comparing the standard deviations? Fcalc = Are the standard deviations for the two locations significantly different at the 95% confidence level? O no yes What is the calculated t value used to compare the means of these two locations? t calc = Are the means for the two different locations significantly different at the 95% confidence level? no yes