Exam 2 - Handout 5 - Practice Questions

Question 1

What does the area under the ROC curve indicate in a diagnostic test performance?

Answer 1

Quantitative data

Question 2

How is variance related to standard deviation in measures of dispersion?

Answer 2

Median

Question 3

What is the difference between sensitivity and specificity in diagnostic test performance?

Answer 3

Sensitivity is the ability of a test to correctly identify individuals with the disease (true positives)

Specificity is the ability of a test to correctly identify individuals without the disease (true negatives)

Question 3

What type of data is typically used for healthcare research w/ large populations?

Answer 3

Standard measure of dispersion

Question 3

Which measure of central tendency is preferred when data have outliers that skew the mean?

Answer 3

Median

Question 4

What does the coefficient of variation (CV) represent in descriptive stats?

Answer 4

Standardized measure of dispersion

Question 5

What does positive skewness indicate about the distribution of data?

Answer 5

More data is concentrated to the left of the mean, with a longer tail extending to the right

Question 6

How do bar charts differ from histograms in data visualization?

Answer 6

Bar charts are used for discrete, categorical data

Histograms are used for continuous data divided into discrete categories

Question 7

What is the difference between interval and ratio data in levels of measurement?

Answer 7

If there is a true zero point or not

Interval data has a defined scale and constant intervals, but NO true zero point

Ratio data has a defined scale, constant intervals, and a true zero point

Question 8

In a box plot, what does the box represent?

Answer 8

Interquartile range