RESEARCH 7 - 3rd Quarter Exam

1. What is the independent variable?

• year / timeframe

• frequency

2. Calculate the mean of the odd-numbered years.

3. Calculate the median of all the given data.

4. Calculate the mode of the even-numbered years.

5. What is the frequency of RCTs in 2003?

• 0

• 8

• cannot be determined

6. What is the total number of RCTs with justified sample calculations identified?

• 3

• 41

• 42

• 27

• cannot be determined

7. A total of 139 eligible RCTs were identified in eight leading orthodontic speciality journals. Therefore, how many of those RCTs are ineligible in this study

8. Which measure of central tendency is most affected by outliers in a data set?

• Mean
• Median
• Mode
• All measures of central tendency are affected equally.

9. How does a small sample size affect the accuracy of the mean, median, and mode?

• It decreases the accuracy of the measures.
• It increases the accuracy of the measures.
• It has no effect on the accuracy of any measure.

10. What are some limitations of using the mean, median, and mode to describe a distribution?

• They cannot account for variability or outliers in the data.
• They are difficult to calculate and interpret.
• They cannot be used to compare distributions with different units of measurement.
• They are only appropriate for small sample sizes.