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4. Which of these is an application of linear regression?
a. File saving b. Predicting sales
c. Drawing shapes d. Coding games

5. Which type of data model is mostly used in business reporting and data warehouses?

a. Dimensional model b. ER model
c. Hierarchical model d. Relational model

6. The formula for a simple linear regression line is:
a. y = mx² + b b. x = y + z
c. y = mx + c d. y = a – bx

7. Which of the following is a benefit of data modelling?
a. Slows down data access b. Makes coding harder

c. Reduces errors and improves clarity d. Removes all types of data

8. What is the role of stakeholders in data modelling?
a. They write the code b. They ignore the model
c. They provide input and feedback d. They repair software

9. graph is best suited for testing the linear relationship between a dependent and independent
variable.
a. Bar chart b. Scatter plot
c. Pie chart d. Line chart

10. In regression, the difference between the actual y value and the predicted y value is called the .
a. Slope b. Outlier
c. Residual d. Y-intercept

B. Fill in the blanks.
1. The model uses diagrams to show the relationships between data.

2. is often used to manage and query data in relational databases.
3. In data modelling, input from is used to design systems.

4. are data points that are significantly different from other data points.
5. In the hierarchical model, each parent can have many children, but each child has only parent.

C. State whether these statements are true or false.
1. The ER model does not use diagrams.

2. The slope of a regression line indicates the strength of the relationship.
3. Data modelling helps to improve communication between teams.

4. A line of best fit can be calculated manually using a formula.
5. Stakeholders are not involved in the data modelling process.

6. Dimensional models increase redundancy to make data analysis easier.
7. In a relational database, every row is called an entity.

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