subject:- business analytics

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Question 21

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Which statement is true about as.integer() command in R?

Select one:

a. It converts decimal value to character value

b. It converts character value to integer value

c. It converts integer value to character value

d. It converts decimal value to integer value

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Question 22

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A scatterplot that appears as a shapeless mass of data points indicates _____ relationship among the variables.

Select one:

a. no

b. a curved

c. a linear

d. a nonlinear

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Question 23

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Excel can be considered as

Select one:

a. Data Warehouse (DW)

b. Application to manage and use data (AMUD)

c. Just a simplest form of database system (DBS)

d. Relational database management system (RDBMS)

e. Database management system (DBMS)

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Question 24

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Which of the following is not a feature of STAR schema used for OLAP model in data warehousing?

Select one:

a. It includes data cube of fact table and multiple dimension tables

b. Each dimension table can have one or more child dimensions

c. Only single join creates the relationship between the fact table and the dimension tables.

d. Dimension table has a primary key and attributes

e. It contains a fact table surrounded by dimension tables.

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Question 25

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Which of the following command is correct to find position of missing values in a vector v1?

Select one:

a. which(v1=="NA")

b. which(v1==NA)

c. which(is.na(v1)=="NA")

d. which(is.na(v1))

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Question 26

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The percentage of variation ( ) can be interpreted as the fraction (or percent) of variation of the

Select one:

a. explanatory variable explained by the regression line.

b. explanatory variable explained by the independent variable.

c. error explained by the regression line.

d. response variable explained by the regression line.

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Question 27

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Credit score is an example of

Select one:

a. Interval data

b. Nominal data

c. Ordinal data

d. Ratio data

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Question 28

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Which of the following R commands will you use to open comma delimited text file from R-console?

Select one:

a. read.data(file.choose( ))

b. read.table(file.choose( ), header = T, )

c. read.data(file.choose(), header = T, t)

d. read.csv(file.choose( ))

e. read.table(file.choose( ), header = T, \t)

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Question 29

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A large collection of business data used to help an organization make decisions is

Select one:

a. Data Mining

b. Business Intelligence

c. Descriptive Analytics

d. Data warehouse

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Question 30

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A correlation between Age and Health of a group of people is found to be -1.003. Which of the following statements is true?

Select one:

a. Age is not a good indicator of health

b. None of the options

c. Age is a good indicator of health