DATA MANAGEMENT Flashcards
(20 cards)
How to get the Array?
Arrange all the values from lowest to highest
How to get the Range?
R=Highest Value - Lowest Value
How to get the Classes?
K = 1+3.322log(n)
How to get the Class Size?
C = R/K
How to get the Class Interval?
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.
How to get frequency?
Just count how many numbers are from the range in the class interval.
How to get class mark?
x = (LL + UL)/2
How to get Class boundary?
LCB = LL – 0.5, UCB = UL + 0.5
How to get Rf%?
Rf% = (f/ Σ f)100
How to get <Cf?
Just copy the first frequency and from there add each frequency to the next on a zigzag pattern.
How to get >Cf?
Start with total frequency and from there minus each frequency to the next on a zigzag pattern.
How to get fx?
Just multiply the frequency from the class mark.
How to get the Mean?
x̄ = (Σ(fx))/n
How to get the Median?
Md = LCBmc + C [(Σf/2 - <Cfbmc)/fmc]
How to get the Median class?
Median Class = Σf/2, when you get the answer, look for the equal or closest greater in the <Cf
How to get Mode?
Mo = LCBmo + C [D1/(D1 + D2)]
D1 = Difference of fmc and f above mc
D2 = Difference of fmc and f below mc
How to get Modal class?
Modal Class = Highest frequency
How to get the Variance?
S² = (Σf (x - x̄)^2)/Σf-1
How to get the Standard Deviation?
SD = √ S²
How to get the correlation variance?
CV = (SD/ x̄)100
