Ramsey

2021-01-06

Two different analytical methods were used to determine residual chlorine in sewage effluents.
Both methods were used on the same samples, but each came from various locations, with
differing amounts of contact time with the effluent. The concentration of Cl in mg//L was
determined by the two methods, and the following results were obtained:

Method$A:0.39,0.84,1.76,3.35,4.69,7.70,10.52,10.92$

Method$B:0.36,1.35,2.56,3.92,5.35,8.33,10.70,10.91$

(a) What type of t test should be used to compare the two methods and why?

(b) Do the two methods give different results?

(c) Does the conclusion depend on whether the 90%, 95% or 99% confidence levels are used?

Method

Method

(a) What type of t test should be used to compare the two methods and why?

(b) Do the two methods give different results?

(c) Does the conclusion depend on whether the 90%, 95% or 99% confidence levels are used?

Roosevelt Houghton

Skilled2021-01-07Added 106 answers

Step 1

The mean is given by

The standard deviation is given by

Step 2

a) We will be using an independent two-sample t-test as we are comparing two different populations.

b) The null and alternative hypotheses are

The test statistic is given by

p - value

Since the p-value is greater than 0.05, we fail to reject the null hypothesis and conclude that there is no significant difference between the two methods.

2021-09-09

please can you sent me the correct answer

xleb123

Skilled2023-06-18Added 181 answers

Andre BalkonE

Skilled2023-06-18Added 110 answers

Jazz Frenia

Skilled2023-06-18Added 106 answers

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