BA01 Introduction to Data Analytics and R Assignment 1

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Subject Code: BA01

Subject Name:

INTRODUCTION TO

DATA ANALYTICS AND R

Component name:

ASSIGNMENT1

Question 1:- Function used to concatenate two strings is

a) join ( )

b) sub ( )

c) contact ( )

d) paste ( )

Question 2:- Function used to remove a variable from the memory is a) remove ( )

b) rm ( )

c) erase ( )

d) delete ( )

Question 3:- Function used to take input from the user is

a) input ( )

b) take ( )

c) scan ( )

d) read ( )

Question 4:- The following is not an operator used in logical comparisons a) & (AND)

b) ! (NOT)

c) | (OR)

d) $ (Concat)

Question 5:- The following function is used to convert a vector into a factor a) factor

b) fac

c) as.fact

d) to.fact

Question 6:- The following function is used to merge two data frames a) together

b) contact

c) join

d) merge

Question 7:- The following function is used to filter records from the data frame based on condition

select subset

condition

chose

Question 8:- Fory=2, the command while (y<5) {print (y^3)} results into

4 9 1 6 6 7 8 endless loop

6 9 1 2

Question 9:- The result of the function is .na ( ) is

Logical Vector

Numeric Vector

Character Vector

String Vector

Question 10:- This function products a scatterplot between two variables with information about missing values shown in the plot`s margin:

matrixplot marginplot

variableplot

missingplot

Question 11:- This function can be used to read a file and create a data frame directly

read.table ( ) read.frame ( )

input.frame ( ) input.table ( )

Question 12:- This function reads the XML file and stores the data in the form of a list.

xmlParse ( ) xmlRead ( )

xml. Read ( ) xml.Parse ( )

Question 13:- Variance is calculated using the function

Varance

Var

Vary

Variance

Question 14:- Standard deviation is calculated by using function

sd ( )

Stddev ( )

dev ( )

d) stddeviation ( )

Question 15:- The function used for picking the same sample from the dataset is a) set ( )

b) set.same ( )

c) set.sample ( )

d) set.seed ( )

Question 16:- The function that gives cumulative probability of an event is a) pbinom ( )

b) dbinom ( )

c) rbinom ( )

d) qbinom ( )

Question 17:- LeveneTest ( ) is available in the package

a) Car

b) Caret

c) normality

d) parametric

Question 18:- ______________ test is a non-parametric alternative for one-sample test: a) Kolmogorov-Smirnow

b) Mann-Whitney-Wilcoxon

c) Shapiro-Wilk

d) Kruskal-Wallis

Question 19:- The non-parametric technique for comparing means is a) t-test

b) ANOVA

c) one-sample t-test

d) Kruskal-Wallis

Question 20:- Log Book System wants to achieve microsegmentation of its customer data. Which of the following techniques/technologies should it use?

a) Traditional BI tools

b) Merging customer transaction information with unstructured data c) General statistical analysis

d) Only text analysis

hihi

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