1. ________ generate random Normal variates with a given mean and standard deviation

a) dnorm

b) rnorm

c) pnorm

d) rpois

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2. Point out the correct statement :

a) R comes with a set of pseudo-random number generators

b) Random number generators cannot be used to model random inputs

c) Statistical procedure does not require random number generation

d) All of the mentioned

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3. ______ evaluate the cumulative distribution function for a Normal distribution

a) dnorm

b) rnorm

c) pnorm

d) rpois

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4. _______ generate random Poisson variates with a given rate

a) dnorm

b) rnorm

c) pnorm

d) rpois

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5. Point out the wrong statement :

a) For each probability distribution there are typically three functions

b) For each probability distribution there are typically four functions

c) r function is sufficient for simulating random numbers

d) None of the mentioned

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6. Which of the following evaluate the Normal probability density (with a given mean/SD) at a point ?

a) dnorm

b) rnorm

c) pnorm

d) rpois

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7. _________ is the most common probability distribution to work with.

a) Gaussian

b) Parametric

c) Paradox

d) All of the mentioned

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

> x <- rnorm(10) > x

a)

[1] 0.01874617 -0.18425254 -1.37133055 -0.59916772 0.29454513 [6] 0.38979430 -1.20807618 -0.36367602 -1.62667268 -0.25647839

b)

[1] 22.20356 21.51156 19.52353 21.97489 21.48278 20.17869 18.09011 [8] 19.60970 21.85104 20.96596

c)

Min. 1st Qu. Median Mean 3rd Qu. Max. 18.09 19.75 21.22 20.74 21.77 22.20

d) All of the mentioned

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9. What will be the output of the following code ?

> x <- rnorm(10) > summary(x)

a)

[1] 0.01874617 -0.18425254 -1.37133055 -0.59916772 0.29454513 [6] 0.38979430 -1.20807618 -0.36367602 -1.62667268 -0.25647839

b)

[1] 22.20356 21.51156 19.52353 21.97489 21.48278 20.17869 18.09011 [8] 19.60970 21.85104 20.96596

c)

Min. 1st Qu. Median Mean 3rd Qu. Max. 18.09 19.75 21.22 20.74 21.77 22.20

d) All of the mentioned

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

> pnorm(2)

a) 0.9772499

b) 1.9772499

c) 0.6772499

d) All of the mentioned

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