Infosys Certified Data Science using R Professional-Part2
Practice with real exam-pattern questions for Infosys Certified Data Science using R Professional-Part2. Each question includes a detailed explanation to help you understand the concept, not just memorise the answer. Try 10 questions free — no login required.
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Join Premium10 Infosys Certified Data Science using R Professional-Part2 practice questions with answers
Real Lex exam-pattern multiple-choice questions for the Infosys Certified Data Science using R Professional-Part2 certification. Each question includes the correct answer. The full question bank is available to Premium members.
- Question 1
EDA summarizes data with which of the following?
- ✓
Graphical Tools
Correct - B
Descriptive Tools
- C
Both Descriptive and Graphical Tools
- D
None of the above
- ✓
- Question 2
You run gradient descent for 15 iterations with a=0.3 and compute J(theta) after each iteration. You find that the value of J(Theta) decreases quickly and then levels off. Based on this, which of the following conclusions seems most plausible?
- ✓
Rather than using the current value of a, use a larger value of a (say a=1.0)
Correct - B
Rather than using the current value of a, use a smaller value of a (say a=0.1)
- C
a=0.3 is an effective choice of learning rate
- D
None of the above
- ✓
- Question 3
Choose the correct statement
In which of the following cases will K-means clustering fail to give good results?1) Data points with outliers
2) Data points with different densities
3) Data points with nonconvex shapes
- ✓
1 and 2
Correct - B
2 and 3
- C
1, 2, and 3
- D
1 and 3
- ✓
- Question 4
One can call the png() function prior to calling a plot function in order to set the name, width, height, and resolution of an exported .png of that plot.
- ✓
TRUE
Correct - B
FALSE
- ✓
- Question 5
Annotation of plots in any plotting system involves adding points, lines, or text to the plot, in addition to customizing axis labels or adding titles. Different plotting systems have different sets of functions for annotating plots in this way. Which of the following functions can be used to annotate the panels in a multi-panel lattice plot?
- ✓
points()
Correct - B
panel.abline()
- C
lines()
- D
axis()
- ✓
- Question 6
Which of the following metrics can be used for evaluating regression models?
i) R Squared
ii) Adjusted R Squared
iii) F Statistics
iv) RMSE / MSE / MAE- ✓
ii and iv
Correct - B
i and ii
- C
ii, iii and iv
- D
i, ii, iii and iv
- ✓
- Question 7
Choose the correct statement
How can you prevent a clustering algorithm from getting stuck in bad local optima?- ✓
Set the same seed value for each run
Correct - B
Use multiple radom initializations
- C
Both A and B
- D
None of the above
- ✓
- Question 8
Which of the following function makes box-and-whisker plots for numerical variables?
- ✓
plot()
Correct - B
bwplot()
- C
xyplot()
- D
all of the mentioned
- ✓
- Question 9
Which of the following determine the least-squares regression line ?
- ✓
histo()
Correct - B
lm
- C
barlm()
- D
all of the mentioned
- ✓
- Question 10
Which parameter to the function allows one to display four plots on the same grid?
- ✓
mfrow=c(2,2)
Correct - B
layout=c(2,2)
- C
mfg=c(2,2)
- D
grd=c(2,2)
- ✓
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