3/23/25, 7:19 CHEM 210 Final Flashcards |
AM
CHEM 210 FINAL EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED
Terms in this set (65)
if the p-value is greater than true
0.1, we generally conclude
the data are consistent with
the null hypothesis
what is the best way to take replicate measurements of your analytes and using
characterize the random error the standard deviation and a t-table specify an error bar
present in a measurement? with a confidence limit
statistical interference true
assesses whether an observed
phenomenon in the data can
reasonably be attributed to
chance or not
suppose we collected a (1) the standard error would decrease, (2) the margin of error would
sample size n = 100 from decrease
some population and used
the data to calculate a 95%
confidence interval for the
population mean. now
suppose we are going to
increase the sample size to n
=
300. keeping all else
constant, which of the
following would we expect to
occur as a result of increasing
the sample size?
in designing a clinical trial paired t-test
where each subject receives
both a placebo and a
proposed treatment, what
statistical test would be most
appropriate?
1/
9
, 3/23/25, 7:19 CHEM 210 Final Flashcards |
AM
an atomic absorption analysis 437 ppm
is to be done on the calcium
in a sample of powdered
milk. a 12.55 gram sample of
the powder is wet ashed in
nitric acid and diluted to
50.00 mL with distilled water.
a 1.00 mL aliquot of this is
transferred to a 50.00 mL
solution using EDTA. using a
wavelength of 422.6 nm in an
atomic absorption
experiment, this diluted
sample showed an
absorbance of 0.375. a
standard calcium sample
(treated the same way) with
a known concentration of
20.0 ppm provided an
absorbance of 0.859. what is
the ppm of calcium in the
powdered milk?
in a 3 step serial dilution: the 200
first dilution is 1/10, the
second dilution is 1/5, and the
third dilution is 1/4. what is
the total dilution factor of
this 3 step serial dilution
procedure?
a solution was prepared by 7.49 ug/mL
mixing 10.00 mL of unknown
(X) with 5.00 mL of standard
(S) containing 8.24 ug/mL
and diluting the mixture to
50.0 mL. the measured signal
areas from an atomic
absorption spectrometer of
X:S was 1.690:1.000. in a
separate experiment in which
the concentrations of X and S
were equal, the measured
signal areas of X:S was
0.930:1.000. the
concentration of X in the
2/
9
AM
CHEM 210 FINAL EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED
Terms in this set (65)
if the p-value is greater than true
0.1, we generally conclude
the data are consistent with
the null hypothesis
what is the best way to take replicate measurements of your analytes and using
characterize the random error the standard deviation and a t-table specify an error bar
present in a measurement? with a confidence limit
statistical interference true
assesses whether an observed
phenomenon in the data can
reasonably be attributed to
chance or not
suppose we collected a (1) the standard error would decrease, (2) the margin of error would
sample size n = 100 from decrease
some population and used
the data to calculate a 95%
confidence interval for the
population mean. now
suppose we are going to
increase the sample size to n
=
300. keeping all else
constant, which of the
following would we expect to
occur as a result of increasing
the sample size?
in designing a clinical trial paired t-test
where each subject receives
both a placebo and a
proposed treatment, what
statistical test would be most
appropriate?
1/
9
, 3/23/25, 7:19 CHEM 210 Final Flashcards |
AM
an atomic absorption analysis 437 ppm
is to be done on the calcium
in a sample of powdered
milk. a 12.55 gram sample of
the powder is wet ashed in
nitric acid and diluted to
50.00 mL with distilled water.
a 1.00 mL aliquot of this is
transferred to a 50.00 mL
solution using EDTA. using a
wavelength of 422.6 nm in an
atomic absorption
experiment, this diluted
sample showed an
absorbance of 0.375. a
standard calcium sample
(treated the same way) with
a known concentration of
20.0 ppm provided an
absorbance of 0.859. what is
the ppm of calcium in the
powdered milk?
in a 3 step serial dilution: the 200
first dilution is 1/10, the
second dilution is 1/5, and the
third dilution is 1/4. what is
the total dilution factor of
this 3 step serial dilution
procedure?
a solution was prepared by 7.49 ug/mL
mixing 10.00 mL of unknown
(X) with 5.00 mL of standard
(S) containing 8.24 ug/mL
and diluting the mixture to
50.0 mL. the measured signal
areas from an atomic
absorption spectrometer of
X:S was 1.690:1.000. in a
separate experiment in which
the concentrations of X and S
were equal, the measured
signal areas of X:S was
0.930:1.000. the
concentration of X in the
2/
9
