**1. How to create axes in the graph?**

**Answer:** Using axes() function custom axes are created.

**2. What is the use of abline() function?**

**Answer:** abline() function is add the reference line to a graph.

**Syntax:-**

**abline(h=yvalues, v=xvalues)**

**3. Why vcd package is used?**

**Answer:** vcd package provides different methods for visualizing multivariate categorical data.

**4. What is GGobi?**

**Answer:** It is an open source program for visualization for exploring high dimensional typed data.

**5. What is iPlots?**

**Answer:** It is a package which provide bar plots, mosaic plots, box plots, parallel plots, scatter plots and histograms.

**6. What is the use of lattice package?**

**Answer:** lattice package is to improve on base R graphics by giving better defaults and it have the ability to easily display multivariate relationships.

**7. What is fitdistr() function?**

**Answer:** It is used to provide the maximum likelihood fitting of univariate distributions. It is defined under the MASS package.

**8. Which data structures are used to perform statistical analysis and create graphs.**

**Answer:** Data structures are vectors, arrays, data frames and matrices.

**9. What is the use of sink() function?**

**Answer:** It defines the direction of output.

**10. Why library() function is used?**

**Answer:** This function is used to show the packages which are installed.