Business Analytics using R Programming MCQ set 2

Q41: Attributes of an object (if any) can be accessed using the___function

• A. objects()
• B. attrib()
• C. attributes()

Answer

Answer C. attributes()

Q42: ___involves predicting a response with meaningful magnitude, such as quantity sold, stock price, or return on investment

• A. Regression
• B. Clustering
• C. Summarization

Answer

Answer A. Regression

Q43: ___provides needed string operators in R

• A. str
• B. forcast
• C. stringr

Answer

Answer C. stringr

Q44: ___splits a data frame and results in an array (hence the da). Hopefully, you’re getting the idea here

• A. apply
• B. daply
• C. stats

Answer

Answer B. daply

Q45: System.time function returns an object of class___which contains two useful bits of information

• A. debug_time
• B. procedure_time
• C. proc_time

Answer

Answer C. proc_time

Q46: Which of the following will start the R program?

• A. $ R
• B. & R
• C. Rb

Answer

Answer A. $ R

Q47: The third step in decision making process is

• A. linear predictions
• B. dependent predictions
• C. making predictions
• D. independent predictions

Answer

Answer C. making predictions

Q48: The decision making step, which consists of organization goals, predicting alternatives and communicating goals is called

• A. organization
• B. alternation
• C. planning
• D. valuing

Answer

Answer C. planning

Q49: The fourth step in decision making process is

• A. linear correlation
• B. making decisions
• C. implement decisions
• D. evaluate performance

Answer

Answer B. making decisions

Q50: The costs that behaves as irrelevant costs in process of decision making are classified as

• A. past costs
• B. future costs
• C. expected costs
• D. sunk costs

Answer

Answer A. past costs

Q51: Which of these is not a topic covered in a typical Business Analyst Aptitude Test?

• A. Analytical Thinking
• C. Data Interpretation
• B. Listening Skills
• D. Risk Management

Answer

Answer D. Risk Management

Q52: If the test should be 30 minutes, Analytical Thinking is taken in how many minutes?

• A. 5
• B. 7
• C. 10
• D. 15

Answer

Answer C. 10

Q53: Primary objective of a business analyst is to help businesses implement

• A. Business systems
• B. Business solutions
• C. Technology systems
• D. Technology solutions

Answer

Answer B. Business solutions

Q54: Which business professional performs cost-benefit analyses of existing and potential customers

• A. Marketer
• B. Financial Analyst
• C. Business Analyst
• D. Sales Representative

Answer

Answer C. Business Analyst

Q55: A Use Case is a set of steps, typically defining interactions between a role, True of False

• A. True
• B. False

Answer

Answer A. True

Q56: Any fact that the solution can assume to be true when the use case begins is what?

• A. A win
• B. A Failure
• C. A success
• D. A Precondition

Answer

Answer C. A success

Q57: A State Diagram is used for what?

• A. Which Events cause a transition between states
• B. Which events cause a success between states
• C. Allowable behaviour
• D. All

Answer

Answer D. All

Q58: A Solution Requirement is comprised of two types of requirements what are they?

• A. Functional
• B. Hard
• C. Existing
• D. Non-Functional

Answer

Answer A. Functional

Q59: Which of the following is used for Statistical analysis in R language?

• A. Studio
• B. RStudio
• C. Heck

Answer

Answer B. RStudio

Q60: R functionality is divided into a number of___

• A. Packages
• B. Functions
• C. Domains

Answer

Answer A. Packages

Q61: Which of the following is an example of vectorized operation as far as subtraction is concerned?

x <- 1:4

y <- 6:9

A. x+y

B. x-y

C. x/y

D. x*y

Answer

Answer B. x-y

Q62: What would be the output of the following code?

x <- 1:4

x > 2

A. FALSE FALSE TRUE TRUE

B. 1 2 3 4

C. 1 2 3 4 5

Answer

Answer A. FALSE FALSE TRUE TRUE

Q63: What would be the value of the following expression?

log(-1)

A. Warning in log(-1): NaNs produced

B. 1

C. Null

D. 0

Answer

Answer A. Warning in log(-1): NaNs produced

Q64: What will be the output of the following code?

g <- function(x) {

• a <- 3
• x+a+y
• ## ‘y’ is a free variable
• }
  
  g(2)

A. 8

B. 9

C. 42

D. Error

Answer

Answer D. Error

Q65: What will be the output of the following code?

function(p) {

params[!fixed] <- p

mu <- params[1]

sigma <- params[2]

Calculate the Normal density

a <- -0.5*length(data)*log(2*pi*sigma^2)

b <- -0.5*sum((data-mu)^2) / (sigma^2)

-(a + b)

} > ls(environment(nLL))

A. “data” “fixed” “param”

B. “data” “variable” “params”

C. “data” “fixed” “params”

D. None of the above

Answer

Answer C. “data” “fixed” “params”

Q66: Which of the following is a principle of analytic graphics?

• A. Don’t plot more than two variables at at time
• B. Make judicious use of color in your scatterplots
• C. Show box plots (univariate summaries)
• D. Show causality, mechanism, explanation

Answer

Answer D. Show causality, mechanism, explanation

Q67: R is an___programming language?

• A. Closed source
• B. GPL
• C. Open source
• D. Definite sourc

Answer

Answer C. Open source

Q68: Who developed R?

• A. Dennis Ritchie
• B. John Chambers
• C. Bjarne Stroustrup

Answer

Answer A. Dennis Ritchie

Q69: R was named partly after the first names of___R authors?

• A. One
• B. Two
• C. Three
• D. Four

Answer

Answer B. Two

Q70: Packages are useful in collecting sets into a___unit?

• A. Single
• B. Multiple

Answer

Answer A. Single

Q71: Many quantitative analysts use R as their___tool?

• A. Leading tool
• B. Programming tool
• C. Both the above

Answer

Answer C. Both the above

Q72: Predictive analysis is the branch of___analysis?

• A. Advanced
• B. Core
• C. Both the above

Answer

Answer B. Core

Q73: ___is used to make predictions about unknown future events?

• A. Descriptive analysis
• B. Predicitive analysis
• C. Both the above

Answer

Answer C. Both the above

Q74: How many steps does the predictive analysis process contained?

• A. 5
• B. 6
• C. 7
• D. 8

Answer

Answer D. 8

Q75: Descriptive analysis tell about___?

• A. Past
• B. Present
• C. Future

Answer

Answer A. Past

Q76: How many types of R objects are present in R data type?

• A. 4
• B. 5
• C. 6
• D. 7

Answer

Answer C. 6

Q77: How many types of data types are present in R?

• A. 4
• B. 5
• C. 6
• D. 7

Answer

Answer A. 4

Q78: Which of the following is a primary tool for debugging?

• A. debug()
• B. trace()
• C. browser()
• D. None of the above

Answer

Answer B. trace()

Q79: Which function is used to create the vector with more than one element?

• A. Library()
• B. plot()
• C. c()
• D. par()

Answer

Answer C. c()

Q80: In R every operation has a___call?

• A. System
• B. Function
• C. None of the above

Answer

Answer A. System