Question

Both BOD and COD test results are expressed in terms of oxygen. Why?

Answer #1

Why is blank titre value higher than back titre value in
chemical oxygen demand (COD) experiment?

When expressed in terms of milliliter of oxygen consumed per kg
of body weight per minute what does 1 MET equal

A BOD test was conducted on the unchlorinated effluent of a
municipal wastewater treatment plant at 20°C. The wastewater
portion added to a 300-mL BOD bottle was 30 mL, and the dissolved
oxygen (DO) values listed below were measured using a
dissolved-oxygen probe. No seed was added to the bottles. What is
the BOD value for each “valid” sample? Valid samples are ones that
do not violate the following two rules:
1. DOf is less than 1.0 mg/L (unclear if...

T test results- t-statistic, df, p-value. What the output means,
both statistically and in terms of differences between the
sites?
t(5) = -5.11, p=0.0037
Anova results- F-statistic, df (between and within groups),
p-value. What the output means, both statistically and in terms of
differences between the sites?
F(5, 36) = 4.26, p=0.0038
Linear Regression results-F-statistic, df (regression and
residual), p-value, R2. What the output means, both statistically
and in terms of differences between the sites?
F(1,91)=794, p=0.011, R2=0.90

A BOD3 test was run and the results were: Dilution = 30 Initial
DO = 9.5 mg/L Final DO = 2.0 mg/L The reaction rate constant k has
been found to be 0.25 day-1 . (a) What is the BOD3? (b)
What would be the ultimate carbonaceous BOD? (c) What is
the BOD5? (d) What would be the remaining oxygen demand
after five days

For
peteroleum engineering:
Why the pore volume compressibility equation is expressed with
a positive sign? And how can I express volume of compressibility in
terms of porosity instead of volume?

.Proteus and Escherichia both have the same results for
Indole test.
a. True
b. False

why is effect size important to report after the results of a
hypothesis test

Glycogen and starch both give a (+) test with I2-KI and a (-)
test with Benedict's. If you hydrolyzed these two polysaccharides
and tested the solutions with the same two reagents what results
would you get? Explain these results.
7.You have run a peroxidase experiment
and obtained the following data:
Time (min)
Buret Reading (ml)
O2 evolved (ml)
0.5
42.0
1.0
36.1
1.5
28.3
2.0
20.5
2.5
12.8
3.0
6.0
3.5
1.2
4.0...

Compare and contrast the following terms: test-retest
reliability with inter-rater reliability. content validity with
both predictive validity and construct validity. internal validity
with external validity. Can a test be reliable without being valid?
Can a test be valid without being reliable? Explain.

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