41. What is the role of exploratory graphs in data analysis?
42. . . . . . . . . evaluate the cumulative distribution function for a Normal distribution.
43. 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)
> set.seed(20)
> x <- rnorm(100)
> e <- rnorm(100, 0, 2)
> y <- 0.5 + 2 * x + e
> summary(y)44. . . . . . . . . describe the type of plot you will produce.
45. . . . . . . . . is used for translating between qplot and base graphics.
46. The elapsed time may be . . . . . . . . than the user time if your machine has multiple cores/processors.
47. . . . . . . . . ensures reproducibility of the sequence of random numbers.
48. . . . . . . . . is used to create a plot to illustrate patterns of missing values.
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