Stats Urgent Help...

[Saad Qadir]

What is Step polygon?
in cumulative frequency polygon we mark Throuh Upper class Boundary or midpoints??
Pls Help Asap

 

[adnanj]

In step poligon the point are joined as stairs.
Upper class boundary

 

[adnanj]

tell me in index number question the 100's column are refered to as base, so we just have to write its a base year ? or further explanation aswell.

 

[Saad Qadir]

No just write 100 means that that year is the base year...
Btw stairs means wat??:S

 

[adnanj]

stairs mean like steps

 

[Saad Qadir]

Ohh so in the question how wud we decide that we have to make dat
ya phir upper class boundaries plot karne se khudi stairs ban jayegi??

 

[adnanj]

take upper class boundary on x axis and plot the points, join the points like steps. Try to search it on net to see the image of step polygon.

btw from which school are u ?

 

[Saad Qadir]

Fps

 

[adnanj]

advantages of mean, median and mode ???

 

[Muhammad Talha]

Ohh so in the question how wud we decide that we have to make dat
ya phir upper class boundaries plot karne se khudi stairs ban jayegi??

If the data is discrete than we have to draw step polygon but if it is in continuous form then we have to draw a cf curve.
For example:-Discrete data is like 1 2 3 4 5 6 7 and
Continuous data like 1-10 10-20 20-35......
Hope this helped

 

[Saad Qadir]

Dude in curve we will only take the upper clas bounaries na??

 

[Saad Qadir]

Ohh so in the question how wud we decide that we have to make dat
ya phir upper class boundaries plot karne se khudi stairs ban jayegi??

If the data is discrete than we have to draw step polygon but if it is in continuous form then we have to draw a cf curve.
For example:-Discrete data is like 1 2 3 4 5 6 7 and
Continuous data like 1-10 10-20 20-35......
Hope this helped

So step polygon is only made in discrete data??

 

[adnanj]

yes we will always take upper class boundary.
Do u know the answers of my questions?

 

[Saad Qadir]

Mean
Advantages:
Easy to calculate
Best measaure ov average when comparing
Rigidly defined by mathematical formula
All items are included in calculation

Disadvantages:
It cannot be calculated if all the values are not present.
Affected by extreme Values..

Mode:
Advantages
Do not have arrange them in order to calculate mode
Can be Found by inspectionnot affected by extremem values
Can be plotted on a graph..

Disadvanges:
There are diff methods of finding mode so there might be more than one answer..
Sometimes there are two modes(bimodal)
It does not take all the observations while calculation

Median:
Not affected by extremem values..
Can be found by inspection..
Can be plotted on a graph
Best measure for qualitative data

Disadvatages:
Has to be arranged in order to find the value
It dose not have sampling stability
It is an estimate in case of even number of items

 

[adnanj]

thankyou very much

 

[Saad Qadir]

Yar but answer this question is step polygon only made for discrete data??

 

[adnanj]

last question ( i hope so)

difference b/w price relative and index number

 

[adnanj]

yes step polygon is only for discrete data

 

[Saad Qadir]

They are da same dude..
Its jus da name is used in different conditions..
But they mean the same