Correct Answer is : data.table

Correct Answer is : group_by()

Correct Answer is : plyr

Correct Answer is : daply

Correct Answer is : forecast

Correct Answer is : stringr

Correct Answer is : install.packages(“forecast”)

Correct Answer is : phi2poly

Correct Answer is : multi.hist

Correct Answer is : count.pairwise

Correct Answer is : describe

Correct Answer is : reliability

Correct Answer is : Sum of the square of residuals ( ∑ (Y-h(X))2) is minimum

Correct Answer is : Couldn’t comment on Test error

Correct Answer is : i, ii, iii and iv

Correct Answer is : 2

Correct Answer is : by its slope

Correct Answer is : lm(formula, data)

Correct Answer is : Vector

Correct Answer is : (Y-Intercept, Slope)