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To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations are different. Location 1 standard deviation: 0.050 Location 2 standard deviation: 0.34 What is the calculated ? value for comparing the standard deviations?

A student determines the concentration of an unknown sample using two different methods. Each method has three different trials; the average, standard deviation and percent error produced by each method is listed below. Method 1 Average: 10.56 M NaOH Standard deviation: 1.35 M NaOH Percent error: 1.25% Method 2 Average: 10.92 M NaOH Standard deviation: 1.02 M NaOH Percent error: 3.45% Which method was more precise? How can you tell?

A student determines the concentration of an unknown sample using two different methods. Each method has three different trials; the average, standard deviation, and percent error produced by each method is listed below. Method 1 Average: 10.56 M NaOH Standard deviation: 1.35 M NaOH Percent error: 1.25% Method 2 Average: 10.92 M NaOH Standard deviation: 1.02 M NaOH Percent error: 3.45% Which method was more accurate? How can you tell?

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how do I calculate the standard deviation of these values?

For the data set, calculate the mean, standard deviation, and variance. mean: \table[[Sample, Value ],[1,4.028], [2,4.011], [3, 4.013], [4, 4.029], [5, 4.017], [6, 4.012]] standard deviation: variance: Ⓒ Macmillan Learning mean: For the data set, calculate the mean, standard deviation, and variance. standard deviation: 3 variance: C Sample 1 2 3 4 5 6 Value 4.028 4.011 4.013 4.029 4.017 4.012

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3. A chemist used two different methods to measure the number of mg of Fe in five iron(II) sulfate supplement tablets. The results of each are shown below. 64.71mg Method 1: 65.03mg 61.55mg 64.9 mg 65.1 mg Method 2: 65.5 mg 66.1mg Calculate the average amount determined by each method as well as the standard deviation and RSD for each method. 63.07mg 65.4mg 67.15mg Which method gave more precise results? How do you know? Is it possible to know which method is more accurate? Why or why not?

Location 1 (% C) To determine the organic material in a dried lake bed, the percent carbon by mass is Sample Location 2 measured at two different locations. To compare the means of the two different locations, it must first be determined whether the standard deviations of the two locations (% C) 60.40 60.10 are different. 60.20 60.90 For each location, calculate the standard deviation and report it with two 60.30 60.20 significant figures. 4 60.40 60.70 60.20 60.30 location 1 standard deviation: location 2 standard deviation: What is the calculated F vae for comparing the standard deviations? Fale = Are the standard deviations for the two locations significantly different at the 95% confidence level? O no O yes What is the calculated i value used to compare the means of these two locations? I cale = Are the means for the two different locations significantly different at the 95% confidence level? O no O yes tv hulu

Consider the following sets of replicate measurements: (1) Calculate the mean and standard deviation of Group A. (2) Determine the confidence interval at 95% confidence level. Assume the data here are the only knowledge you have and no previous measurements are available.

How do I calculate the average value and the average deviation? Did calculate the average of each substance correctly in the box?

You measure 35 turtles' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 3.1 ounces. Based on this, construct a 99% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places ounces

How do you find the standard deviation and average deviation using the data table above?

Using the volumes :22.97 mL, 22.86 mL, 22.89 mL, 22.92 mL Calculate the mean (average) volume mL Calculate the % relative average deviation % Calculate the standard deviation (2 decimal places) Calculate the % relative standard deviation of the mean value decimal place) % (1

Two students measured the density of water three times each. Their results are shown below. Trial Student 1       Student 2 1 0.953 g/mL          1.102 g/mL 2 0.949 g/mL          1.005 g/mL 3 0.956 g/mL          0.901 g/mL9. Calculate the standard deviation in the measurements for student 1 and then do the same for student 2. Show your work

Dr. Caras was characterizing a cytochrome (an iron containing protein) from a new strain of bacteria. He obtained eight measurements of the percent iron in the protein: 0.3205%, 0.3202%, 0.3196%, 0.3198%, 0.3316%, 0.3197%, 0.3208%, and 0.3197%. Calculate the mean () and standard deviation (s) for these results. x = Use the Grubbs test to determine if one of these values is an outlier. What is the value of Gealeulated? Gcalculated = Should this potential outlier be rejected with 95% confidence? Critical values of G can be found in this table. The potential outlier should be kept. The potential outlier should be rejected.

Analytical Chemistry

To determine the organic material in a dried lake bed, the percent carbon by mass is measured at two different locations. 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 and report it with two significant figures. What is the calculated F value for comparing the standard deviations? Are the standard deviations for the two locations significantly different at the 95% confidence level? ample Location 1 (% C) Location 2 (% C) 1 10.40 10.10 2 10.30 10.90 3 10.30 10.20 4 10.40 10.70 5 10.30 10.30

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