**1. Why search() function is used?**

**Answer:** search() function helps to see that which packages are currently loaded.

**2. On which type of data binary operators are worked?**

**Answer:** Binary operators are worked on matrices, vectors and scalars.

**3. What is the use of doBY package?**

**Answer:** It is used to define the desired table using function and model formula.

**4. Which function is used to create frequency table?**

**Answer:** Frequency table is created by table() function.

**5. Define loglm() function.**

**Answer:** Loglm() function is used to create log-linear models.

**6. What is the use of corrgram() function?**

**Answer:** corrgram() function is used to plot correlograms.

**7. How to create scatterplot matrices?**

**Answer:** Pair() or splom() function is used for create scatterplot matrices.

**8. What is the use of diagnostic plots?**

**Answer:** It is used to check the normality, heteroscedasticity and influential observations.

**9. Define anova() function.**

**Answer:** anova() is used to compare the nested models.

**10. What is cv.lm() function?**

**Answer:** It is defined under the DAAG package which is used for k-fold validation.