What is the primary purpose of the psych package in R?

Which package in R is commonly used for data manipulation and transformation tasks?

A. dplyr

B. manipulateR

C. datawrangler

D. reshape2

What is the primary purpose of the ggplot2 package in R?

A. Statistical analysis and modeling

B. Data visualization and plotting

C. Machine learning and predictive modeling

D. Data import and export

In R, which package is specifically designed for working with time series data?

A. forecast

B. timeSeries

C. tsdata

D. chron

Which package provides functions for fitting linear and nonlinear mixed-effects models in R?

A. lme4

B. nlme

C. mixedmodels

D. lmnlme