**1. Define leaps().**

**Answer:** It is used to perform the all-subsets regression and it is defined under the leaps package.

**2. Define relaimpo package.**

**Answer:** It is used to measure the relative importance of each of the predictor in the model.

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

**Answer:** It provide a variety of regression including scatter plots, variable plots and it also enhanced diagnostic.

**4. Define robust package.**

**Answer:** It provides a library of robust methods including regression.

**5. What is robustbase?**

**Answer:** It is a package which provides basic robust statistics including model selection methods.

**6. Define plotmeans().**

**Answer:** It is define under gplots package which includes confidence intervals and it produces mean plot for single factors.

**7. What is the full form of MANOVA?**

**Answer:** MANOVA stands for multivariate analysis of variance.

**8. What is the use of MANOVA?**

**Answer:** By using MANOVA we can test more than one dependent variable simultaneously.

**9. Define mshapiro.test( ).**

**Answer:** It is a function which defines in mvnormtest package. It produces the Shapiro-wilk test for multivariate normality.

**10.Define barlett.test().**

**Answer:** Barlett.test() is used to provide a parametric k-sample test of the equality of variances.