1.
Which of the following is a common way to detect multicollinearity in regression analysis?
Correlation matrix
Histogram
Box plot
Pie chart
2.
In a data warehouse, which schema is characterized by having a central fact table surrounded by dimension tables?
Snowflake schema
Star schema
Galaxy schema
Hierarchical schema
3.
What is the difference between a primary source and a secondary source of data?
Primary data is collected firsthand, while secondary data is collected by someone else
Secondary data is collected firsthand, while primary data is collected by someone else
Primary data is always quantitative, while secondary data is always qualitative
Secondary data is always quantitative, while primary data is always qualitative
4.
Which of the following is an example of a quantitative data type?
Customer reviews
Product colors
Revenue in dollars
Employee job titles
5.
Which of the following is a measure of central tendency?
Variance
Range
Median
Standard deviation
6.
Which of the following metrics is commonly used to evaluate the performance of a classification model?
Mean Absolute Error
Accuracy
Variance
Standard Deviation
7.
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
8.
Which of the following is NOT a type of data visualization?
Scatter plot
Line graph
Data table
Data entry form
9.
In statistical terms, what does the term "mean" refer to?
The most frequently occurring value in a dataset
The middle value when data is ordered
The average of a set of numbers
The difference between the highest and lowest values
10.
In data modeling, what does ER stand for in ER diagrams?
Entity Relationship
Effective Range
Error Ratio
Estimated Results
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