Infosys Certified Data Science using R Professional-Part1
Practice with real exam-pattern questions for Infosys Certified Data Science using R Professional-Part1. 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-Part1 practice questions with answers
Real Lex exam-pattern multiple-choice questions for the Infosys Certified Data Science using R Professional-Part1 certification. Each question includes the correct answer. The full question bank is available to Premium members.
- Question 1
Find the median of the set = {2, 4, 4, 3, 8, 67, 23}
- ✓
5.5
Correct - B
4
- C
3
- D
8
- ✓
- Question 2
What is the output of the below code in R 11 %/% 3
- ✓
0.0
Correct - B
1.0
- C
2.0
- D
3.0
- ✓
- Question 3
Which of the following is a correct statement?
- Inf and -Inf are positive and negative infinity
- NaN means 'Not a Number'
- NA means Not Available
- ✓
2 and 3
Correct - B
2 only
- C
3 only
- D
1, 2 and 3
- Question 4
State True or False : Conditional probability is undefined if the conditioning event has zero probability
- ✓
true
Correct - B
false
- ✓
- Question 5
You forgot the last digit of a 7-digit all numeric password. If you randomly enter the final 3 digits after correctly enter the first four, then what is the chance of cracking the right password?
- ✓
1 by 1000
Correct - B
3 by 1000
- C
4 by 99
- D
1 by 999
- ✓
- Question 6
A drilling company has estimated a 40% chance of striking oil for their new well. A detailed test has been scheduled for more information. Historically, 60% of successful wells have had detailed tests, and 20% of unsuccessful wells have had detailed tests.
Given that this well has been scheduled for a detailed test, what is the the probability that the well be successful?
- ✓
2/3
Correct - B
1/6
- C
6/20
- D
1/3
- ✓
- Question 7
Refer to the following data and then answer the questions asked
X 4 6 9 10 11 Y 2 4 4 7 8 What is the value of the correlation coefficient?
- ✓
0.91
Correct - B
0.76
- C
-0.91
- D
0.83
- ✓
- Question 8
The advantages of using R language
- ✓
Open source and Free
Correct - B
Packages are available to execute most of the functionalities.
- C
Platform independent
- D
All the above
- ✓
- Question 9
Which of the following command will help us to rename the second column in a dataframe named “table” from alpha to beta?
- ✓
colnames(table)[2]="beta"
Correct - B
setnames(table,’alpha’,’beta’)
- C
Both A and B
- ✓
- Question 10
Which ensemble method creates several subsets of data from original data with replacement and aggregate the final results by combining the results from training different subsets?
- ✓
Boosting
Correct - B
Bagging
- C
Stacking
- D
None
- ✓
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