example midterm

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School

University of Guelph *

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Course

3700

Subject

Chemistry

Date

Feb 20, 2024

Type

pdf

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Uploaded by ConstableStraw20898

Name_______________________________ Student ID_______________________ 1 Food *3700 Total: 55 marks 1. Define 5 of the following terms (10 marks total) : Papillae End point bias Duo trio test One sided test Validity Sensory evaluation 2. Answer the following questions (5 marks each) : a) There are four types of scales commonly used for sensory testing. Identify the two of the four types, provide an example of each and discuss the type of data collected and how you would analyze the data for the example that you provided. b) You have woken up to the smell of frying bacon. As you walk from your room to the kitchen the smell gets stronger but after a few minutes of standing in the kitchen talking with your roommate (who is frying the bacon), you notice that the smell is no longer obvious. Explain how you were able to perceive the aroma in the first instance and then why you stopped being able to smell anything. c) Is the phrase “I can’t taste anything, I have a cold” the correct phrase to use when you are suffering from a cold? Justify your answer. d) You have been asked to conduct a sensory test for liking of chocolate ice cream. This product is aimed at children between the ages of 10 and 15. It is the summer and therefore you can’t go to the local school to recruit your panelists. There is a local fair coming up and you decide to set up a testing booth at the fair to get enough panelists to have sufficient data to analyze. Discuss the advantages and disadvantages of running this ice cream taste panel at the local fair.

Name_______________________________ Student ID_______________________ 2 e) You have been asked to run a sensory panel to evaluate 4 different brands of frozen French fries for crispness. The client you are working for wants you to test the crispness of each French fry 3 times and he wants you to test the product using 10 panelists. What type of an experimental design will you use? In your answer, show the order of the samples that you will present to the 10 judges at each replicate of testing. f) Consumer testing has indicated that your pizza sauce has too much garlic. The product has been reformulated to reduce the garlic flavour and this has been verified by bench-top screening. Sensory testing is to be conducted to confirm these results. A paired comparison test was run to determine which of the two samples is stronger in garlic flavour. Forty-five panelists were chosen to complete the test. 35 of the 45 respondents selected the reformulated sauce as containing less garlic. Should the pizza sauce be replaced with the reformulated sauce? Justify your answer.

Name_______________________________ Student ID_______________________ 3 3. Mom’s milk has just started producing low sugar strawberry flavoured milks. Their original strawberry flavoured milk is sweetened with sucrose. They now want to launch a sucralose (Splenda) sweetened strawberry flavoured milk. This milk needs to be of comparable sweetness to their original milk. They have hired you to find out if a difference exists between the two products. You have read that people who live in Ontario have a different sweetness threshold than people who live in Newfoundland. You decide that you need to conduct your difference test in two locations (one at University of Guelph) and the other in St John’s Newfoundland. Your first test at Guelph is run in the sensory lab. 28 responses are collected during testing. 30ml of sample are presented at refrigerator temperature (2°C). Because the samples may be slightly different in colour, the samples are tested under red lights. The average age of the panelist used for this test is 25. Testing in Newfoundland is conducted in the lobby of the local Sobey’s supermarket. A table is set up in the entranceway of the supermarket and individuals are asked to be a part of the testing as they are walking by the table. The samples are pre-poured and served at room temperature. Because you don’t have a refrigerator to keep the samples cold, you serve the samples in 250ml polystyrene coffee cups. 125ml of sample is poured into the cups and presented for testing. The average age of the panelist for this test was 60 years old. 22 panelists completed the test. In both locations, the same test was conducted. It was a triangle test and the wording on the questionnaire was to drink the entire sample and indicate which sample was the odd sample. A partially constructed table of results is shown below: # correct identifications # incorrect identifications Total responses Significance (Y/N) Guelph, Ontario 15 28 St John’s Newfoundland 10 26 Total 54

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Name_______________________________ Student ID_______________________ 4 Answer the following questions about this research a) Complete Table 1 and interpret all of the results of this research (meaning interpret results from each location as well as the total of the two locations). (7 marks) b) Suggest and discuss reasons for any differences that may have occurred in the data between the two locations (5 marks) c) Mom is not happy with the results of the test. She feels that the data does not answer her question (is the artificially sweetened product comparable to the sucrose sweetened product in terms of sweetness?). She asks you to repeat the test using a different test. Outline what test you will select to use and discuss the test with regard to the question you will ask and the data you will analyze (3 marks) ++++++++++++++++++++ End of midterm test