Question
Plating of gold on wrist watches requires a chemical called AiCl3. 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 AiCI3 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 | 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 AiCI3 gives same result or 3 not. (Use )
Answer :
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Skip in 10
For the three concentrations the observed thickness values are 5% : 3, 2, 4, 2, 4 15% : 4, 4, 3, 2, 4 25% : 3, 3, 4, 4, 2 First find totals and means. For 5% : total = 3+2+4+2+4 = 15, mean = 15/5 = 3 For 15% : total = 4+4+3+2+4 = 17, mean = 17/5 = 3.4 For 25% : total = 3+3+4+4+2 = 16, mean = 16/5 = 3.2 Grand total = 15+17+16 = 48 Total number of observations N = 15 Grand mean = 48/15 = 3.2 Now compute the total sum of squares [ \sum x^2
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