Subjective Evaluation - PART 3

Question 1

What is the goal of Sensory Evaluation Methods?

Answer 1

Match the right test/method with the right question

Question 2

3 general methods that answer questions in sensory evaluation

Answer 2

• discrimination tests
• descriptive analysis test
• affective/hedonic tests

Question 3

What type of test: are two products different from one another?

Answer 3

Discrimination test

Question 4

Advantage of discrimination test

Answer 4

Quick and simple

Question 5

Limitation of discrimination test

Answer 5

Limited results—only yes or no

Question 6

Basic setup of discrimination tests

Answer 6

• 25 to 50 panelists
• screening for acuity (sharpness of perception i.e. color blindness, sensitivity of tongue and nose)
• triangle, duo-trio or paired comparison tests

Question 7

How is analysis done in discrimination tests?

Answer 7

Frequency of yes and no; refer to statistical table to determine if significant or not

Question 8

What is the triangle test?

Answer 8

Choose sample that is most different

Question 9

What is duo-trio test?

Answer 9

Choose sample that matches the reference

Question 10

Why is it called duo-trio?

Answer 10

Duo: two samples are compared
Trio: reference is added

Question 11

What is paired comparison test?

Answer 11

To determine which sample has better specified quality (i.e. sweetness)

Question 12

What type of test: How do products differ in all sensory attributes?

Answer 12

Descriptive tests

Question 13

Advantage of descriptive tests

Answer 13

Detailed quantitative information

Question 14

Limitation of descriptive tests

Answer 14

Time consuming

Question 15

Basic setup of descriptive tests

Answer 15

• 8 to 12 trained panelists
• screened for acuity
• asked to rate intensity for all sensory attributes

Question 16

How is analysis done in descriptive tests?

Answer 16

T-test or ANOVA to determine if statistically different

Question 17

What does panelist training mean for decriptive test

Answer 17

• trained means they are able to evaluate in a similar way
• Panelists must have same answers (i.e. sweetness of sugar of 10%)

Question 18

True or False: Descriptive tests uses booths

Answer 18

False: only use long table with equipment and interact with everyone

Question 19

What test/analysis is the only one with panel interaction?

Answer 19

Descriptive analysis

Question 20

How is the sample ballot for descriptive tests done?

Answer 20

• all attributes encountered are listed down and rated each

Question 21

What type of graph is used for analysis in descriptive tests and why?

Answer 21

Spider graph to easily show which attributes differ

Question 22

True or false: Product advertisements that use sensory qualities to advertise are expected to conduct descriptive analysis

Answer 22

True; to have proof or backup for their claims but not all companies have sensory teams

Question 23

What type of test: Are the products liked?

Answer 23

Consumer Acceptance Tests

Question 24

Advantage of consumer acceptance test

Answer 24

Provides essential information if they like it or not

Question 25

Limitation of consumer acceptance test

Answer 25

Difficult to get a representative sample of consumers

Question 26

Basic setup of consumer acceptance test

Answer 26

• 75 to 150 consumers per test
• screened for product use (do they buy the product? How often?)
• asked degree of liking or preference questions

Question 27

Basic setup of consumer acceptance test

Answer 27

• 75 to 150 consumers per test
• screened for product use (do they buy the product? How often?)
• asked degree of liking or preference questions

Question 28

How many points is the hedonic scale?

Answer 28

9 points

Question 29

What type of scale is used in consumer acceptance tests?

Answer 29

Hedonic scale

Question 30

What scale is used if children are evaluators?

Answer 30

Smiley scale

Question 31

It is the “pepsi challenge” test used in marketing research

Answer 31

Preference test

Question 32

Flow of product testing in food companies

Answer 32

Product/Concept > prototype > testing > modified prototype > verification > final product

Question 33

Tests used for prototype and verification in product testing

Answer 33

• consumer affective
• descriptive/physicochemical measurements

Question 34

When to use discrimination test in product testing?

Answer 34

Use if an attribute needs to be modified