R Programming Language Certification Statistical Analysis & Modeling

Question 1

Which function in R fits a linear regression model?

Accepted Answer

lm()

Answer

glm()

Answer

regress()

Answer

linearModel()

Question 2

What does the p-value in a t-test represent?

Accepted Answer

The probability of observing results as extreme as observed, assuming H0 is true

Answer

The probability the null hypothesis is true

Answer

The effect size of the difference

Answer

The confidence level of the test

Question 3

Which function performs a Shapiro-Wilk test for normality in R?

Accepted Answer

shapiro.test()

Answer

ks.test()

Answer

normality.test()

Answer

lillie.test()

Question 4

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

Accepted Answer

Computes correlation coefficients between variables

Answer

Corrects outliers in data

Answer

Runs a regression model

Answer

Performs ANOVA

Question 5

Which function performs a one-way ANOVA in R?

Accepted Answer

aov()

Answer

anova_test()

Answer

oneway()

Answer

f.test()

Question 6

What does the summary() function return when applied to an lm() object?

Accepted Answer

Coefficients, R-squared, F-statistic, and p-values

Answer

Only the residuals

Answer

A plot of the regression line

Answer

Only the model formula