PHCH 667 Exam 1 Complete set with
Questions and correct Answers
1. Predictive value for a positive Qualitative Test is best describes as:
a. both answers are correct
b. PPV = TP/(TP+FP) - the number of a true positive values divided by all observed positive
values
c. NPV = TN/(TN+FN) - the number of true negative values divided by all observed negative
values - correct answer-✅b. PPV = TP/(TP+FP) - the number of a true positive values divided
by all observed positive values
2. There are two kindergarten classes from different parts of a city in which five boys (5 years of
age) were randomly selected to see how their weights compared to the national average of boys
this age, which is 41 pounds. Below are the data for the selective five boys from each of the two
classes:
Class 1: 34, 38, 52, 42 and 34 pounds
Class 2: 40, 44, 40, 38 and 38 pounds
Which class provides a more precise representation of the weight of this class of 5 year old
boys?
a. Class 1
b. Class 2
c. They are equally accurate - correct answer-✅b. Class 2
3. For a Qualitative Test, sensitivity is determined by:
a. TP/(TP+FP) - the number of true positives divided by all positive results seen by the test
b. TP/(TP+FN) - the number of true positives divided by all results that should have been
positive - correct answer-✅b. TP/(TP+FN) - the number of true positives divided by all results
that should have been positive
4. Precision is best represented by which of the following?
a. Variance
b. Standard deviation
c. Mean (average)
d. Gaussian distribution - correct answer-✅b. Standard deviation
5. Predictive value for a negative Qualitative Test is best describes as:
, a. both answers are correct
b. PPV = TP/(TP+FP) - the number of a true positive values divided by all observed positive
values
c. NPV = TN/(TN+FN) - the number of true negative values divided by all observed negative
values - correct answer-✅c. NPV = TN/(TN+FN) - the number of true negative values divided
by all observed negative values
6. Accuracy is best represented by which of the following?
a. Standard deviation
b. Variance
c. Gaussian distribution
d. Mean (average) - correct answer-✅d. Mean (average)
7. For a Qualitative Test, specificity is determined by:
a. TN/(TN+FP) - the number of true negatives divided by all results that should have been
negative
b. TN/(TP+FN) - the number of true negatives divided by all the true positive and negative
values - correct answer-✅a. TN/(TN+FP) - the number of true negatives divided by all results
that should have been negative
8. There are two kindergarten classes from different parts of a city in which five boys (5 years of
age) were randomly selected to see how their weights compared to the national average of boys
this age, which is 41 pounds. Below are the data for the selective five boys from each of the two
classes:
Class 1: 34, 38, 52, 42 and 34 pounds
Class 2: 40, 44, 40, 38 and 38 pounds
Which class provides a more accurate representation of the weight of this class of 5 year old
boys?
a. Class 1
b. Class 2
c. They are equally accurate - correct answer-✅b. Class 2
1. Which is the correct definition of international unit for enzyme activity?
a. Amount of enzyme that catalyzes the conversion of one kilogram of substrate in 1 h
b. Amount of enzyme that catalyzes the conversion of one micromole of substrate in 1 minute
c. Amount of enzyme that catalyzes the conversion of one micromole of substrate in 1 h
Questions and correct Answers
1. Predictive value for a positive Qualitative Test is best describes as:
a. both answers are correct
b. PPV = TP/(TP+FP) - the number of a true positive values divided by all observed positive
values
c. NPV = TN/(TN+FN) - the number of true negative values divided by all observed negative
values - correct answer-✅b. PPV = TP/(TP+FP) - the number of a true positive values divided
by all observed positive values
2. There are two kindergarten classes from different parts of a city in which five boys (5 years of
age) were randomly selected to see how their weights compared to the national average of boys
this age, which is 41 pounds. Below are the data for the selective five boys from each of the two
classes:
Class 1: 34, 38, 52, 42 and 34 pounds
Class 2: 40, 44, 40, 38 and 38 pounds
Which class provides a more precise representation of the weight of this class of 5 year old
boys?
a. Class 1
b. Class 2
c. They are equally accurate - correct answer-✅b. Class 2
3. For a Qualitative Test, sensitivity is determined by:
a. TP/(TP+FP) - the number of true positives divided by all positive results seen by the test
b. TP/(TP+FN) - the number of true positives divided by all results that should have been
positive - correct answer-✅b. TP/(TP+FN) - the number of true positives divided by all results
that should have been positive
4. Precision is best represented by which of the following?
a. Variance
b. Standard deviation
c. Mean (average)
d. Gaussian distribution - correct answer-✅b. Standard deviation
5. Predictive value for a negative Qualitative Test is best describes as:
, a. both answers are correct
b. PPV = TP/(TP+FP) - the number of a true positive values divided by all observed positive
values
c. NPV = TN/(TN+FN) - the number of true negative values divided by all observed negative
values - correct answer-✅c. NPV = TN/(TN+FN) - the number of true negative values divided
by all observed negative values
6. Accuracy is best represented by which of the following?
a. Standard deviation
b. Variance
c. Gaussian distribution
d. Mean (average) - correct answer-✅d. Mean (average)
7. For a Qualitative Test, specificity is determined by:
a. TN/(TN+FP) - the number of true negatives divided by all results that should have been
negative
b. TN/(TP+FN) - the number of true negatives divided by all the true positive and negative
values - correct answer-✅a. TN/(TN+FP) - the number of true negatives divided by all results
that should have been negative
8. There are two kindergarten classes from different parts of a city in which five boys (5 years of
age) were randomly selected to see how their weights compared to the national average of boys
this age, which is 41 pounds. Below are the data for the selective five boys from each of the two
classes:
Class 1: 34, 38, 52, 42 and 34 pounds
Class 2: 40, 44, 40, 38 and 38 pounds
Which class provides a more accurate representation of the weight of this class of 5 year old
boys?
a. Class 1
b. Class 2
c. They are equally accurate - correct answer-✅b. Class 2
1. Which is the correct definition of international unit for enzyme activity?
a. Amount of enzyme that catalyzes the conversion of one kilogram of substrate in 1 h
b. Amount of enzyme that catalyzes the conversion of one micromole of substrate in 1 minute
c. Amount of enzyme that catalyzes the conversion of one micromole of substrate in 1 h
