R Programming Language Certification Statistical Analysis & Modeling in R 2

Question 1

Which R function fits a logistic regression model?

Accepted Answer

glm() with family = binomial

Answer

lm() with type = logistic

Answer

logit()

Answer

glm() with family = gaussian

Question 2

What does the confint() function return for a fitted model in R?

Accepted Answer

Confidence intervals for model coefficients

Answer

A confidence interval for the mean response

Answer

The model's AIC score

Answer

A bootstrap sample

Question 3

Which R function tests whether a numeric vector follows a normal distribution using the Shapiro-Wilk test?

Accepted Answer

shapiro.test()

Answer

normtest()

Answer

ks.test()

Answer

normalcy()

Question 4

What is the purpose of the predict() function in R?

Accepted Answer

Generate predicted values from a fitted model for new data

Answer

Fit a new model

Answer

Cross-validate a model

Answer

Compute model residuals

Question 5

Which R package provides tools for cross-validation and training machine learning models with a unified interface?

Accepted Answer

caret

Answer

mlr

Answer

tidymodels

Answer

scikit

Question 6

Which test in R is appropriate for testing association between two categorical variables in a contingency table?

Accepted Answer

Both chisq.test() and fisher.test()

Answer

chisq.test()

Answer

fisher.test()

Answer

prop.test()