Part 3

Question 1

What are the advantages and disadvantage of internal and external panelists?

Answer 1

Internal:
Adv:
1. People on the spot
2. No payment
3. Confidentiality
Disadvantages:
1. Knowledge of product may influence results
2. Availability
3. Difficult to replace panelist

External:
Adv:
1. Availability
2. Large number
3. No risk of offending if not chosen
Disadv.
1. Expensive
2. Must be trained
3. Old or student
4. Risk of loosing after payment

Question 1

What is nominal data?

Answer 1

Categorical assignment of numbers to
items, as if merely labelling. E.g. gender, age etc

Question 2

What is ordinal data?

Answer 2

Arranging products in an ordered series, e.g. slight, moderate, strong.

Question 3

What is interval data?

Answer 3

Interval data is measured along a numerical scale that has equal distances between adjacent values.

Question 4

What is a food action scale (FACT)?

Answer 4

A Food Action (FACT) scale is a form of hedonic scale. It is assumed that what
the panellists say they will do is correlated with how much they like the product

Question 5

What type of test should one perform for categorical data?

Answer 5

Non -parametric tests such as Friedmans test

Question 6

What type of test should one perform for continuous data?

Answer 6

ANOVA and if difference observed further analysis can be conducted such as least significant difference.

Question 7

What is a disadvantage of leas significant difference test (LSD)? And the Scheffe’s test

Answer 7

That difference may be found even if they are no present.

On the other hand, the Scheffe’s test is too precise and might no notice differences where they actually are.

Question 8

What is the most commonly used test to find out difference between pairs?

Answer 8

The Tukey’s test.

Question 9

What is ratio data?

Answer 9

Data where the panellist will be given a product which is used as reference for ranking or the panelist is free to choose the ranking and following samples change according.

Question 10

What is time intensity testing and when would you use it?

Answer 10

Analysis of change in flavor, texture over time by scoring at interval or continuous tracking. Might be very laborious work as different panelist might chew differently and/or use the continuous tracking paper differently.