4. a) Plating of gold on wrist watches requires a chemical called . AiCI 3
Concentration of
the chemical that is added to the solution is an important factor. The objective is to
choose that concentration for which plating is uniform. Three concentration of AiCI 3
chosen were 5%, 15% and 20%. These were added in the solution and plating was
done and thickness (in units) measured on 5 samples is gives below.
Sample
→
↓
Conc. of AiCI3
1 2 3 4 5
5% 3 2 4 2 4
15% 4 4 3 2 4
25% 3 3 4 4 2
Use ANOVA to comment on whether the concentration of AiCI gives same result or 3
not. (Use 05.0 α = )
The given data is-
Let
: The concentartion of gives same same results.
:The concentartion of does not gives same same results.
The variance table is given by-
The combines sample size
The number of samples
The mean of the combined sample-
The Mean square for treatment(MST)-
The Mean square for Error(MSE)-
Then,
For Annova test the degree of freedom and
The Tabulated value of F at degree of freedome 2 and 10 at 0.05 level of significance is 4.10
Conclusion: As The calculated value of F is greater than the tabulated F at 95% level of significance.
So is rejected. Hence The concentartion of does not gives same same results
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