Analyst 2 Analyst 3 10.14 10.19 10.12 10.11 10.04 10.15 10.07 10.12
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Hi, please help me to answer this. Please do this in MS EXCEL. So I can use it as a guide. Thank you!
Transcribed Image Text:B. Four analysts carry out replicate sets of determinations of mercury (Hg) on the same analytical sample. The
results in ppb Hg are shown below
Determination
Analyst 1
Analyst 2
Analyst 3
Analyst 4
1
10.24
10.14
10.19
10.19
10.26
10.12
10.11
10.15
3
10.29
10.04
10.15
10.16
4
10.23
10.07
10.12
10.10
(a) State the appropriate hypothesis
(b) Do the the analysts differ at the 95% confidence interval? At the 99% confidence level (Fcrit = 5.95)? At the
99.9% confidence interval (Fcrit = 10.80)?
(c) Which analysts, differ from each other at the 95% confidence level?
2.
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Transcribed Image Text:A. The spreadsheet below shows the results of two different analytical methods used to determined calcium
(Ca) in a standard sample. Method A is the accepted method, and Method B is a newly developed procedure.
Method Method
B
20.4
21.0
25.4
23.6
25.1
22.2
22.5
|17.8
24.9
24.2
26.2
21.6
(a) find the means of the two methods, the standard deviations and the standard deviations of the means
(b) Give the 95% confidence interval for the means of the two methods
(c) Do the variances differ at the 95% confidence interval
(d) Do the t-test and test the null hypothesis that the two means are equal at the 95% confidence interval
Solution
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