Appl Of Ms Excel In Analytical Chemistry
2nd Edition
ISBN: 9781285686691
Author: Crouch
Publisher: Cengage
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Students have asked these similar questions
The gold content of an ore is being measured. The results of these analyses are:
Content (ppt)
20.065
19.999
21.054
20.533
20.088
20.112
What is the average value, standard deviation and confidence interval for this set of data?Show each step of the calculation.
Using your results calculate the %accuracy and %precision (relative standard deviation) if the true value is 20.045%.
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
Suppose a normally distributed set of data with 8900 observations has a mean of 123 and a standard
deviation of 16. Use the 68-95-99.7 Rule to determine the number of observations in the data set expected
to be above a value of 107. Round your answer to the nearest whole value.
Hint: This problem is asking for how many observations not the percent.
Answer
Tip: Don't round any probabilities or percentages in your calculations. Keep all decimal places and round at
the END of the problem.
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Similar questions
- I am supposed to calculate Average absolute deviation (%). I am not sure if 7.16 is the final answer, or do i need to multiply by 100 because they are asking for percent?arrow_forwardFor the data set, calculate the mean, standard deviation, nd variance. mean: standard deviation: variance: Sample 1 2 3 4 5 6 Value 8.016 8.022 8.024 8.028 8.029 8.015arrow_forwardWhich of the statements below are TRUE regarding the mean and standard deviation? I As the number of measurements increases, x approaches u if there is no random error. II The square of the standard deviation is the average deviation. III The mean is the center of the Gaussian distribution. IV The standard deviation measures the width of the Gaussian distribution. O land I Il and II O , Ill and IV O Ill and IVarrow_forward
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