R Programming Questions and Answers – Simulation – 2

This set of R Programming Questions for entrance exams focuses on “Simulation – 2”.

1. _________ ensures reproducibility of the sequence of random numbers.
a) sets.seed()
b) set.seed()
c) set.seedvalue()
d) set.value()
View Answer

2. Point out the correct statement?
a) When simulating any random numbers it is not essential to set the random number seed
b) It is not possible to generate random numbers from other probability distributions like the Poisson
c) You should always set the random number seed when conducting a simulation
d) Statistical procedure does not require random number generation
View Answer

3. 5 Normal random numbers can be generated with rnorm() by setting seed value to ______________
a) 1
b) 2
c) 3
d) 4
View Answer

4. _______ function is used to simulate binary random variables.
a) dnorm
b) rbinom()
c) binom()
d) rpois
View Answer

5. Point out the wrong statement?
a) Drawing samples from specific probability distributions can be done with “s” functions
b) The sample() function draws randomly from a specified set of (scalar) objects allowing you to sample from arbitrary distributions of numbers
c) The sampling() function draws randomly from a specified set of objects
d) You should always set the random number seed when conducting a simulation
View Answer

6. What will be the output of the following R code?

> set.seed(10)
> x <- rbinom(100, 1, 0.5)
> str(x)

a)

 int [1:100] 1 0 0 1 0 0 0 0 1 0 ...

b)

 int [1:100] 10 0 01 1 0 0 01 0 1 0 ...

c)

 int [1:100] 1 03 0 1 0 0 0 02 1 0 ...

d)

 int [1:100] 1 2 3 1 1 0 0 0 1 0 ...

7. __________ distribution is commonly used to model data that come in the form of counts.
a) Gaussian
b) Parametric
c) Poisson
d) Simulation
View Answer

8. What will be the output of the following R code?

 > rpois(10, 1)

a)

 [1] 7 0 1 1 2 1 1 4 1 2

b)

 [1] 0 8 1 1 2 1 1 4 1 2

c)

 [1] 0 0 1 1 2 1 1 4 1 2

d)

 [1] 0 0 0 0 0 0 0 1 4 1 2

9. Which of the following code represents count with mean of 2?
a) rpois(10, 2)
b) rpois(10, 20)
c) rpois(20, 2)
d) rpois(20, 20)
View Answer

10. What will be the output of the following R code?

> set.seed(20)
> x <- rnorm(100)
> e <- rnorm(100, 0, 2)
> y <- 0.5 + 2 * x + e 
> summary(y)

a)

Min. 1st Qu. Median Mean 3rd Qu. Max.
-6.4080 -1.5400 0.6789 0.6893 2.9300 6.5050

b)

Min. 1st Qu. Median Mean 3rd Qu. Max.
-6.4080 -10.5400 0.6789 5.6893 2.9300 6.5050

c)

Min. 1st Qu. Median Mean 3rd Qu. Max.
-1.4080 -6.5400 0.6789 0.6893 2.9300 6.5050

d) Error
View Answer

Sanfoundry Global Education & Learning Series – R Programming Language.

Here’s the list of Best Books in R Programming Language.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]