Question

When reporting averages, standard deviation is used as the uncertainty or error. Briefly explain why standard deviation is more important than the absolute uncertainty of the instrument when multiple measurements are involved.

Answer #1

Standard deviation (SD) measures the degree of variability or diversity among studied elements or variables. Standard deviation is based on the average mean of variables and tells us about how the data is distributed about the mean value.

Standard deviation is obtained by first getting the average of the given data. Once the average is obtained, it is then subtracted individually from the single data with the result being squared thereafter. Standard deviation can be further calculated by getting the square root of the summed up results of individually squared variables, which was divided by the number of variables presented in the given data.

When the resulting standard deviation is large, it indicates that the data points are far from the obtained average. But when the standard deviation is small, it is indicative that the given variables are close to the computed mean.

If
someone measured a height to have a standard deviation of 1ft,
explain why it would be necessary and important to know if you were
measuring a person or a building. Which would have more error? Does
the standard deviation alone tell you how accurate you are?

When experiments are performed it is important that results are
accurate and precise. (standard deviation or percent
error) is a measure of how close a measurement or set of
measurements is to the true value, and can be measured by
(accuracy or precision). (standard
deviation or percent error) is a measure of how reliable
the data is (i.e. how close trials are to each other), and can be
measured by (accuracy or precision)
Choose the correct choice where it is...

Why
should standard deviation NOT be used when evaluating the riskiness
of a stock that is considered to be included in a well-diversified
portfolio?

Briefly explain how RFID can be used to manage inventory. In
your answer, please explain why item-level tagging is more
expensive than case-level tagging. What might be some benefits of
item-level tagging over case-level tagging?

When the population standard deviation is
unknown:
A)There will be a large amount of sampling error.
B)The resulting margin of error for a confidence interval
estimate will tend to be fairly small.
C)The critical value will be negative.
D)The t-distribution must be used to obtain the critical
value.

Explain the conceptual problem with the variance that is the
reason why the standard deviation is gernally used instead?

The standard addition method is used when
a. the sample matrix is very complicated
b. something in the sample interferes with the analysis of the
analyte
c. the instrument is unstable over time
d. the detection limit for the analyte is too high
The answer is B, please explain why and why other answers are
wrong!

Briefly explain why a combination of clavulanic acid and
amoxicillin is used to successfully treat beta-lactamase-producing,
penicillin-resistant bacterial infections that are not affected by
either clavulanic acid or amoxicillin when they are used alone.

Explain briefly why receptor-mediated endocytosis is
more selective when compared to other types of bulk
transport?

Explain briefly why recrystallization can never result in 100%
mass recovery even if you used pure material. Also explain why mass
recovery is greater if you cool to 0 degrees C rather than room
temperature.
Explain very briefly why mass recovery is reduced if you use an
excess amount of boiling solvent and why washing product crystals
with excessive amounts of solvent especially warm solvent can
result in reduced mass recovery.

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