R interview questions part 14
R interview questions part 14
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. Every ________ function has a probability distribution function.
Correct Answer is : Continuous
2. Which package resorts to numerical methods when it encounters a model it does not recognize.
Correct Answer is : distrEx
3. When µ = ___ and σ = ___ we say that the random variable has a standard normal distribution.
Correct Answer is : 0,1
4. Which of the following is the symbol of standard normal PDF?
Correct Answer is : φ
5. The __________ package has functionality to investigate transformations of univariate distributions.
Correct Answer is : Distr
6. Which distribution looks like a norm distribution but with very heavy tails?
Correct Answer is : Cauchy
7. The ________ is represented by the location parameter.
Correct Answer is : Median
8. The ______ parameter influences the spread of the distribution about its median.
Correct Answer is : Scale
9. Which distribution comes up a lot in Bayesian statistics because it is a good model for one’s prior beliefs about a population proportion?
Correct Answer is : Beta
10. The associated R function is dlogis (x, location = 0, scale = 1) is for _________ distribution.
Correct Answer is : Logistic
11. The _________ distribution comes up in differential equations as a model for population growth under certain assumptions.
Correct Answer is : Logistic
12. Which of the following is a distribution derived from the normal distribution?
Correct Answer is : Lognormal
13. The associated R function is dlnorm(x, meanlog = 0, sdlog = 1) is for ________ distribution.
Correct Answer is : Lognormal
14. The associated R function is dweibull(x, shape, scale = 1) is for _________ distribution.
Correct Answer is : Weibull
15. Which of the following is a principle of analytic graphics?
Correct Answer is : Show causality, mechanism, explanation
16. What is the role of exploratory graphs in data analysis ?
Correct Answer is : They are typically made very quickly.
17. Which of the following is true about the base plotting system ?
Correct Answer is : Plots are created and annotated with separate functions
18. Which of the following is an example of a valid graphics device in R?
Correct Answer is : A PDF file
19. Which of the following is an example of a vector graphics device in R?
Correct Answer is : SVG
20. Bitmapped file formats can be most useful for
Correct Answer is : Scatterplots with many many points
