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Paired Comparison (Preference) Test
In this test the assessor is presented with two coded products and asked to indicate whether there is a preference between them. The test design should ensure that each sample is assessed equally often in first and second position. The panel size should be at least 50. If the panel is drawn from staff on site, care should be taken to exclude people who may have particular knowledge of the nature of the work or knowledge of the objectives for carrying out the work. Bear in mind that such a panel is unlikely to be representative of the target consumer population. At the simplest level the assessor is asked to state which sample is preferred and to offer reasons for preference. No - preference discussions are usually allowed and although, they are excluded from analysis, they are usually reported. This is a two - tailed test, as it is not known in advance which product is preferred, and both directions are of equal interest. The basic statistical analysis is by reference to two - tailed binomial tables, and the reasons for preference are tabulated. Comparative assessments of acceptability or preference can be undertaken using the paired (preference) method or by the ranking test.
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Types of spectral interferences: While a quantitative analysis using a standard calibration curve is carried out, the calibration plot of emission intensity vs concentration o
When an electron revolves in a stationary orbit then: (1) It absorbs energy (2) It emits radiation (3) Its energy remains constant (4 )It gains kinetic energy Ans:
Distinguish between van''t Hoff Method and Oswald Isolation Method. In each case give an expression for the rate of reaction.
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Why conjugation increasaes the stability of a molecule?
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The total number of orbitals in an energy level designated by principal quantum number n is equal to: (1) 2n (2) 2n 2 (3) n
Explain significance of orthogonality rule
A 0.5 m 3 rigid tank is filled with saturated liquid water at 200 o C. A valve at the bottom of the tank is opened, and liquid is withdrawn from the tank. Heat is transferred to t
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