17.01.2015 Views

LibraryPirate

LibraryPirate

LibraryPirate

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

SUMMARY OF FORMULAS FOR CHAPTER 2<br />

SUMMARY OF FORMULAS FOR CHAPTER 2 55<br />

Formula Number Name Formula<br />

2.3.1 Class interval width<br />

using Sturges’s rule<br />

2.4.1 Mean of a population<br />

2.4.2 Skewness<br />

2.4.2 Mean of a sample<br />

2.5.1 Range<br />

2.5.2 Sample variance<br />

2.5.3 Population variance<br />

2.5.4 Standard deviation<br />

2.5.5 Coefficient of variation<br />

w = R k<br />

m =<br />

x =<br />

s 2 =<br />

s 2 =<br />

N<br />

a x i<br />

i =1<br />

N<br />

Skewness =<br />

n<br />

a x i<br />

i =1<br />

n<br />

R = x L - x S<br />

n<br />

a 1x i - x2 2<br />

i =1<br />

n<br />

a 1x i - m2 2<br />

i =1<br />

n - 1<br />

N<br />

n<br />

a 1x i - x2 2<br />

s = 2s 2 i = 1<br />

= Q n - 1<br />

C.V. = S x 11002%<br />

n<br />

2n a 1x i - x2 3<br />

a a<br />

n<br />

i = 1<br />

i =1<br />

2n a<br />

n<br />

3>2<br />

1x i - x2 2 b<br />

i =1<br />

1x i - x2 3<br />

=<br />

1n - 122n - 1 s 3<br />

2.5.6 Quartile location in<br />

ordered array<br />

Q 1 = 1 1n + 12<br />

4<br />

Q 2 = 1 1n + 12<br />

2<br />

Q 3 = 3 1n + 12<br />

4<br />

2.5.7 Interquartile range IQR = Q 3 - Q 1<br />

(Continued)

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!