VEN 125- Midterm 2 Actual Exam
Questions & Correct detailed Answers
with rationales
Type I Error - correct answerAlpha
Falsely reject Ho (false positive)
Type II Error - correct answerBeta
Falsely accept Ho (false negative)
Paired directional - correct answerPicking which sample is ____ (saltier, sweeter, etc.)
p=.5 (one-tailed)
2 serving orders
Triangle - correct answerPicking the odd sample.
p=0.33 (one-tailed)
6 serving orders
Duo-Trio - correct answerPick which is the same to a reference.
p= 0.5 (one-tailed)
Single reference = 2 serving orders
2 out of 5 test - correct answer3 cleaned and 2 spiked
P= 0.1
very fatiguing with wine
p = Probability that results could have occurred by chance alone
1‐p = Probability that a real difference was perceptible
, paired preference test - correct answerwhich do you prefer? (consumer test)
p=0.5 (2-tailed test)
Rossler tables
Types of sensory evaluation - correct answerAnalytical sensory evaluation-Interested in the WINE and its
attributes
Consumer sensory evaluation-Interested in CONSUMERS reactions to the wine
Power - correct answer1-beta
Probability of finding a difference (if one exists)- Depends on alpha, # of judgements, size of the
difference between the samples, directionality (one tailed has more power)
Z-test - correct answerZ=(X-np)-0.5/sqrt(npq)
n= # responses
p = probability of guessing right
q = 1-p
Duo‐trio test for new blend versus old - correct answerResults: p=0.059
use the new blend since the pair test did not reject the null but H 2S IS detected by some percentage of
your consumers
Make the decision "CONSERVATIVELY"
Use more people (increase power)
Use higher Type I error level (e.g., decrease b, increase power)
Increase alpha level from p<0.05 to p<0.10
Duo‐trio test for aroma difference with more expensive and finicky yeast - correct answerResults:
p=0.022
The difference is barely detectable (since 14/20 would have failed to reject the null), and the difference
in cost is LARGE
Recommend against it
Questions & Correct detailed Answers
with rationales
Type I Error - correct answerAlpha
Falsely reject Ho (false positive)
Type II Error - correct answerBeta
Falsely accept Ho (false negative)
Paired directional - correct answerPicking which sample is ____ (saltier, sweeter, etc.)
p=.5 (one-tailed)
2 serving orders
Triangle - correct answerPicking the odd sample.
p=0.33 (one-tailed)
6 serving orders
Duo-Trio - correct answerPick which is the same to a reference.
p= 0.5 (one-tailed)
Single reference = 2 serving orders
2 out of 5 test - correct answer3 cleaned and 2 spiked
P= 0.1
very fatiguing with wine
p = Probability that results could have occurred by chance alone
1‐p = Probability that a real difference was perceptible
, paired preference test - correct answerwhich do you prefer? (consumer test)
p=0.5 (2-tailed test)
Rossler tables
Types of sensory evaluation - correct answerAnalytical sensory evaluation-Interested in the WINE and its
attributes
Consumer sensory evaluation-Interested in CONSUMERS reactions to the wine
Power - correct answer1-beta
Probability of finding a difference (if one exists)- Depends on alpha, # of judgements, size of the
difference between the samples, directionality (one tailed has more power)
Z-test - correct answerZ=(X-np)-0.5/sqrt(npq)
n= # responses
p = probability of guessing right
q = 1-p
Duo‐trio test for new blend versus old - correct answerResults: p=0.059
use the new blend since the pair test did not reject the null but H 2S IS detected by some percentage of
your consumers
Make the decision "CONSERVATIVELY"
Use more people (increase power)
Use higher Type I error level (e.g., decrease b, increase power)
Increase alpha level from p<0.05 to p<0.10
Duo‐trio test for aroma difference with more expensive and finicky yeast - correct answerResults:
p=0.022
The difference is barely detectable (since 14/20 would have failed to reject the null), and the difference
in cost is LARGE
Recommend against it
