1.
In a normal distribution, approximately what percentage of data falls within one standard deviation of the mean?
50%
68%
95%
99%
2.
What type of analysis helps in identifying patterns, trends, or correlations in data using historical data?
Prescriptive analysis
Predictive analysis
Descriptive analysis
Diagnostic analysis
3.
What is the purpose of a confusion matrix in classification tasks?
To visualize data distributions
To summarize the performance of a classification model
To calculate the mean of predictions
To determine the correlation between variables
4.
Which of the following is an example of unstructured data?
Customer transaction records
Database tables
Social media posts
Excel spreadsheets
5.
Which of the following best defines the purpose of hypothesis testing in data analysis?
To determine the correlation between two variables
To confirm the null hypothesis is true
To draw conclusions about a population based on sample data
To find missing values in a dataset
6.
Which of the following is a key principle of data visualization?
Adding as many colors as possible
Maximizing the amount of data on the screen
Simplifying the presentation of complex data
Using multiple chart types in one visualization
7.
In predictive modeling, what is overfitting?
A model that captures noise instead of the actual pattern
A model that generalizes well to new data
A model with too few variables
A model that only works for large datasets
8.
What does R-squared represent in a regression analysis?
The slope of the regression line
The strength of the relationship between variables
The probability of error
The standard deviation of residuals
9.
Which of the following is a common challenge in data analysis?
Data redundancy
Data integrity issues
Incomplete data
All of the above
10.
What is the function of a foreign key in relational databases?
It links records between tables
It stores unique data
It automatically indexes data
It normalizes data
Questions Answered: 0/10