IB Math Studies Chi Square IA Essay
IB Math Studies
Spring 2013
Table of Contents:
Introduction/Purpose……………………………………………………………..p.3
Data Collection Method……………………………………………………….....p. 3  4
Data Analysis: ChiSquared Statistic
Frequency Table…………………………………………………………p. 4  5 Contingency Table……………………………………………………….p. 5 – 6
Chi – Squared Statistic…………………………………………………...p. 7
Degrees of Freedom………………………………………………………p. 7
Critical Value……………………………………………………………..p. 7 – 8
Conclusion……………………………………………………………………....p. 9  10
Introduction/Purpose Predictability is the degree to which a correct prediction or forecast of a system’s state …show more content…
A
93100
B
8592
C
7784
D
7076
F
Below 70
Total
Less than 1 hour
36
1 – 2 hours
66
2 – 3 hours 66
3+
hours
32
Total
86
49
37
19
9
200
Next, I stated the null (H0) and the alternative (H1) hypothesis for this data. Hypothesis testing involves the careful construction of two statements: the null and alternative. The null hypothesis holds that there will be no observed effect in our experiment. The alternative or experimental hypothesis holds that there will be an observed effect for our experiment. The following hypotheses are formulated below:
H0: Grade averages are independent on time spent daily on social media websites.
HI: Grade averages are dependent on time spent daily on social media websites.
Chi  Square Statistic:
Chi – Square is a

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