# FAST FASHION

## FAST FASHION

2015/6/11

OUR TEAMMATES:
Jessica, CHOI Pui-hang
Hin, HIU Cheuk-hin
Mandy, Lei Yan-man
Ko, KO Tak-hung
Cissy, Tam Lai-sze
Nelson, LIU Kin-tak

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CONTENT FOR TODAY :
1. Introduction to Chi-Square
2. Relationship between Hypothesis & Chi-Square?
3. What should we consider before the calculation?
4. Case Study & the Calculation
5. Conclusion
6. Q&A

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CHI SQAURE METHOD

NULL HYPOTHESIS
The chi-square test is always testing what scientists call the

Chi-square (Chi-sqaure Goodness of Fit Test)

NULL HYPOTHESIS, which states that there is no significant

i. A statistical test commonly used

difference between the expected and observed result.

ii. To compare observed data with data we would expect to
obtain according to a specific hypothesis.

The formula for calculating chi-square is :

iii. Chi-square requires that you use numerical values, not
percentages or ratios

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2015/6/11

WHAT IS H0?
H0 = Null hypothesis

Scientific shorthand for the null hypothesis. Approaches that utilize the scientific
method, including business process improvement techniques, must include
the null hypothesis, which can be described as the default state or lack of a
meaningful connection between two sets of data, so that other positive
hypotheses can be compared against a baseline.

If other hypotheses generate usable results, the null hypothesis can be rejected.

WHAT IS H1?
H1 = Alternative hypothesis

A way of referring to the alternative hypothesis in a scientific experiment or

WHAT IS X2 ?
X2 = Chi-square

It is used to test to either reject or accept the null hypothesis.