Lesson 1 , 2 and 3

Question 1

Two basic categorizations of data is?

Answer 1

Organized and Unorganized

Question 2

Which are the three basic areas of DS?

Answer 2

Maths , Computer Programming and Domain Knowledge

Question 3

Full form of EDA is?

Answer 3

Exploratory Data Analysis

Question 4

Big data is too large to be processed by ?

Answer 4

a single machine

Question 5

Model is a _____ between two elements.

Answer 5

relationship

Question 6

Text , video and audio are types of _____ data.

Answer 6

Unorganized

Question 7

Data in the form of rows and columns is _____ data

Answer 7

Organized

Question 8

Columns depict ____________ of the data.

Answer 8

Features/ Characteristics

Question 9

Skikitlearns ___________ helps convert unstructured to structured.

Answer 9

CountVectorizer

Question 10

Average tweet length is _____

Answer 10

30

Question 11

Qualitative data can be described using numbers and mathematical operations can be performed on it. True or false ?

Answer 11

False. It is for quantitative

Question 12

Average monthly customers. Qualitative or Quantitative?

Answer 12

Quantitative

Question 13

Country of coffee origin? Quali or quanti

Answer 13

Quali

Question 14

Zip code? Quali or Quanti

Answer 14

Quali

Question 15

Quantitative can be further divided into ________ and __________ type.

Answer 15

Continuous and Discrete

Question 16

The four levels of data are ____________?

Answer 16

Nominal, Ordinal, interval, ratio

Question 17

Nominal level is qualitative or quantitative?

Answer 17

Qualitative

Question 18

Measure of center for nominal level is ?

Answer 18

Mode

Question 19

___________ is most common ordinal level scale

Answer 19

Likert

Question 20

At ordinal level ______ is the usual measure of center

Answer 20

Median

Question 21

________ denotes a long comment (more than a single line)

Answer 21

”’

Question 22

The measure that describes how spread out our data is ________

Answer 22

Standard deviation

Question 23

Does ratio data level allow multiplication & division?

Answer 23

Yes

Question 24

Data at the ratio level is usually ______.
1. non-negative
2. Positive

Answer 24

Non-negative

Question 25

Three questions that you should ask before starting the analysis are?

Answer 25

* Is the data organized or unorganized? * Is each column quantitative or qualitative? * At what level of data is each column?

Question 26

The first step to performing data science is :

Answer 26

Asking an interesting question

Question 27

Last step while performing data analysis is:

Answer 27

5. Communicating and visualizing the results

Question 28

How many steps are there while performing data analysis?

Answer 28

5

Question 29

State any 3 basic questions you should think of while exploring the data.

Answer 29

Organized or not? What does each row represent? What does each column represent? Are there any missing data points? Do we need to perform any transformations?

Question 30

dataset.shape gives us?

Answer 30

number of rows and columns in the dataset

Question 31

date is which type of data ?

Answer 31

Ordinal

Question 32

Stars is which type of data?

Answer 32

ordinal

Question 33

Which command can be used to check if there are any missing values?

Answer 33

df.isnull().sum()

Question 34

The name dataframe is borrowed from which language?

Answer 34

R

Question 35

Each column in df is considered to be a _________ object?

Answer 35

Series

Question 36

Which 4 stats come up when nominal variables are described?

Answer 36

Count, unique, freq , top

Question 37

In the titanic dataset, what type of data is age?

Answer 37

Ratio

Question 38

Survived (Yes/No) is which type of data?

Answer 38

Nominal

Question 39

When dealing with missing values , which two options do we have?

Answer 39

Drop the rows which have missing values , try to fill them in

Question 40

What drawback does dropping rows with empty values have

Answer 40

Risk of losing valuable data

Question 41

An object having both magnitude and direction is a ________.

Answer 41

Vector

Question 42

A matrix having same number of rows and columns is called a _______ matrix?

Answer 42

Square

Question 43

Sigma symbol is an universal symbol for _________

Answer 43

Addition

Question 44

When dot product is performed , the answer is a ______________? Scalar / vector

Answer 44

Scalar

Question 45

x axis denotes the ______ variable , while y axis denotes the ______ variable.

Answer 45

independent , dependent