AKT AKT Data Interpretation and Analysis 2 — Questions and Answers
Question 1: Which analysis method is used to determine if there is a significant difference between the means of three or more groups?
- T-test
- Chi-square test
- ANOVA (Correct answer)
- Linear regression
Correct answer: ANOVA
Analysis of Variance (ANOVA) tests whether the means of three or more groups are statistically different from each other.
Question 2: In a box plot, the line inside the box represents the:
- Mean
- Median (Correct answer)
- Mode
- Standard deviation
Correct answer: Median
The line inside the box of a box plot always represents the median (50th percentile) of the dataset.
Question 3: What does a scatter plot primarily show?
- Frequency distribution of one variable
- Relationship between two continuous variables (Correct answer)
- Proportion of categories in a whole
- Change in a variable over time
Correct answer: Relationship between two continuous variables
A scatter plot displays individual data points plotted on two axes to visualize the relationship or correlation between two continuous variables.
Question 4: Which data analysis technique would you use to predict a continuous outcome from one or more predictor variables?
- Logistic regression
- Linear regression (Correct answer)
- Chi-square test
- Cluster analysis
Correct answer: Linear regression
Linear regression models the linear relationship between predictor variables and a continuous outcome variable to make predictions.
Question 5: A dataset has a mean of 50 and a standard deviation of 5. What percentage of data falls within one standard deviation of the mean in a normal distribution?
- 50%
- 68% (Correct answer)
- 95%
- 99.7%
Correct answer: 68%
In a normal distribution, approximately 68% of data falls within one standard deviation (±1 SD) of the mean.
Question 6: When data is described as 'skewed right,' which statement is true?
- The mean is less than the median
- The tail extends to the left
- The mean is greater than the median (Correct answer)
- The distribution is symmetric
Correct answer: The mean is greater than the median
In a right-skewed distribution, the tail extends to the right, pulling the mean above the median.
AKT AKT Data Interpretation and Analysis 2
Which analysis method is used to determine if there is a significant difference between the means of three or more groups?