Page 42 - Basic Statistics

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f c
Q1 = L q 1 + f q 1 1 . W
q
1

 ...... - ........
Q1 = ........+  .  ...... = .......... + ......... = ........
 ...... 

Q3 lies in the (3n/4)th observation, where 3n /4 = .......... = ..... .

In the column of cumulative frequencies, the .....th observation contained in the

class “ ....... - ....... “. thus,

f c
Q3 = L q 3 + f q 3 3 . W q 3


Q3 = ........+  ...... - ........ .  ...... = .......... + ......... = ........
 ...... 

Interquartile range = Q3 – Q1 = ……. – ……. = …….

Variance :

p    p  2 


2
 f i ( X i ) −   f i X i  n / 


i= 1  i  = 1  
2
S =  
n − 1
.......... ..... - ((........ ...) 2 / .......)
=
..........− 1

= ………

The standard deviation is the square root of the variance. If you have
2
obtained variance S = …….. then the standard deviation is

S = .......... = …….
...

~~* CHAPTER 2 NUMERICAL MEASURES TO SUMMARIZE DATA *~~