**1. What is fligner.test()?**

**Answer:** It is a function which provides a non-parametric k sample test of the equality of variances.

**2. Define hovplot().**

**Answer:** It is define in HH package which provides a graphic test of homogeneity of variance based on brown forsyth.

**3. Which variables are represented by lower case letters?**

**Answer: **Numerical variables are represented by lower case letters.

**4. Which variables are represented by upper case letters?**

**Answer:** Categorical factors are represented by upper case letters.

**5. What is logistic regression?**

**Answer:** Logistic regression is used to predict the binary outcome from the given set of continuous predictor variables.

**6. Define Poison regression.**

**Answer:** It is used to predict the outcome variable which represents counts from the given set of continuous predictor variable.

**7. Define Survival analysis.**

**Answer: **It includes number of techniques which is used for modeling the time to an event.

**8. What is the use survfit() function?**

**Answer:** It estimates a survival distribution one or more groups.

**9. Define survdiff().**

**Answer:** It determines the differences in survival distribution between two or more groups.

**10. What is coxph()?**

**Answer:** It is a function which is used to model the hazard function on the set of predictor variable.