DATA MANAGEMENT

Question 1

How to get the Array?

Answer 1

Arrange all the values from lowest to highest

Question 2

How to get the Range?

Answer 2

R=Highest Value - Lowest Value

Question 3

How to get the Classes?

Answer 3

K = 1+3.322log(n)

Question 4

How to get the Class Size?

Answer 4

C = R/K

Question 5

How to get the Class Interval?

Answer 5

For the lower limit, start with the lowest value and add the Class Size as you go all the way down. And for the upper level just minus 1 from the 2nd row and put it on the answer preceding that row.

Question 6

How to get frequency?

Answer 6

Just count how many numbers are from the range in the class interval.

Question 7

How to get class mark?

Answer 7

x = (LL + UL)/2

Question 7

How to get Class boundary?

Answer 7

LCB = LL – 0.5, UCB = UL + 0.5

Question 8

How to get Rf%?

Answer 8

Rf% = (f/ Σ f)100

Question 9

How to get <Cf?

Answer 9

Just copy the first frequency and from there add each frequency to the next on a zigzag pattern.

Question 10

How to get >Cf?

Answer 10

Start with total frequency and from there minus each frequency to the next on a zigzag pattern.

Question 11

How to get fx?

Answer 11

Just multiply the frequency from the class mark.

Question 12

How to get the Mean?

Answer 12

x̄ = (Σ(fx))/n

Question 13

How to get the Median?

Answer 13

Md = LCBmc + C [(Σf/2 - <Cfbmc)/fmc]

Question 14

How to get the Median class?

Answer 14

Median Class = Σf/2, when you get the answer, look for the equal or closest greater in the <Cf

Question 15

How to get Mode?

Answer 15

Mo = LCBmo + C [D1/(D1 + D2)]
D1 = Difference of fmc and f above mc
D2 = Difference of fmc and f below mc

Question 16

How to get Modal class?

Answer 16

Modal Class = Highest frequency

Question 17

How to get the Variance?

Answer 17

S² = (Σf (x - x̄)^2)/Σf-1

Question 18

How to get the Standard Deviation?

Answer 18

SD = √ S²

Question 19

How to get the correlation variance?

Answer 19

CV = (SD/ x̄)100