Statistics-101

Question 1

What is the central tendency?

Answer 1

Central tendency is the measure to show where the data points are centered

Question 2

What are the three measures of central tendency?

Answer 2

Mean, Median & Mode

Question 3

What is the measure of Dispersion?

Answer 3

It shows the variability of data scattered

Question 4

Should the central and measure of Dispersion both be required for better interpretation?

Answer 4

Yes

Question 5

How the mean of data is represented?

Answer 5

x bar

Question 6

How the mean and median is obtained?

Answer 6

The mean = sum of values/ Total no of values
Medain = First arrange the data is ascending or descending order , & if the no of values are odd then the observation at (n/2 +1 ) is the medain , *& if the no of values are even then the mean of (n/2)th and (n/2 + 1 )th is the median

Question 7

Write a Programme to find the mean?

Answer 7

public static int findMean(int arr[]) {
if(arr.length == 0)
return 0;

	int mean= 0;

	for (int i = 0; i < arr.length; i++) {
		mean= mean + arr[i];
	}

	return mean/arr.length;
}

Question 8

What is meant by Statistics?

Answer 8

procure meaningful data to enrich the context

Question 9

What are the 4 basic stages of Stats?

Answer 9

Collect > Organise > Analyse > Interpret > Present

Question 10

What is Primary & Secondary Data?

Answer 10

Primary Data is data gathered by someone with some objective in mind
Secondary Data is data gathered from a readymade source

Question 11

What care is important with Secondary Data?

Answer 11

It must come from a reliable source

Question 12

What is a Range?

Answer 12

The difference of Highest-Lowest datum

Question 13

What is a Range?

Answer 13

The difference of Highest-Lowest datum

Question 14

What is a Frequency distribution?

Answer 14

No of Repetitions of data or event

Question 15

What is Class Interval?

Answer 15

Grouping of data in sub ranges

Question 16

What is a Class Width or Class SIze?

Answer 16

The subrange size we choose for class interval

Question 17

What basic info we can get form Grouped Frequency Distribution?

Answer 17

We can get a good apportioned advice, that where the data is inclined

Question 18

In case of grouped frequency distribution , in case we have weight 30.5 , so where it will belong

Answer 18

get the gap between tow intervals and divide by 2, add the result in intervals lower limit and upper limit

Question 19

What is a Grouped Frequency Distribution?

Answer 19

It shows the majority of data inclined , A good use case is the policy is applied to 10 states and then after implementation the many states
showed the ploicy result , so we may need not to do it singly , we can subgropu the whole state in range intervals and see the result percentage

Question 20

What are the types of data

Answer 20

Categorical and Numerical

Question 21

What are categorical types

Answer 21

Like groups and then yes or no options

Question 22

What are the types of numerical data

Answer 22

Continuous and discreet

Question 23

What are types of measurement

Answer 23

Qualitative and Quantitative

Question 24

What are the types of qualitative

Answer 24

Ordinal it could be qualitative Quantitative

Nominal it is value but not having any order like seasons

Question 25

What basis the graphs are divided?

Answer 25

Types of Data & Measurement Levels

Question 26

What are the most general categorical Represntations?

Answer 26

Pie Chart, Paracto Diagrams, BAr Charts And Pie Charts

Question 27

What kind of data represention does Bar Chart has?

Answer 27

Frequescy DIstribution

Question 28

What kind of data representation does Pie Chart has?

Answer 28

Including Frequency Distribution it has Relative Frequeny DIstribuition, e.g. Market SHare

Question 29

What are characteristics of Pareto Diagram?

Answer 29

It is again a Bar Chart , but the categories are shown in decending order of frequency

Question 30

What ios best practiser to visualize the numerical data?

Answer 30

Since it has dipersed values, it is better to group them in class intervals and make a frewquency distribution

Question 31

How to create the class distributioons?

Answer 31

Largest - smallest / no of desired intervals

Question 32

Does the lower and upper value of the extreme class intervals must include the lowest and tyhe highest value?

Answer 32

Yes, and thus in a class interval the the lower

Question 33

How to calculate relative frequency?

Answer 33

frequency of the event in the class interval/ total frequency

Question 34

What is Side by Side chart?

Answer 34

It shows collective data for an entity in multiple areas