ETC1000 Study Guide - Final Guide: Pie Chart, Null Hypothesis

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Questions + Notes
Tuesday, 22 May 2018
6:08 PM
Write probability as decimal and not percentage
Independent > no correlation between variables
Independent when Pr(A|B) = x, for all x
o Pr(A|B) = Pr(A) * Pr (B)
Positive distribution - Mean is greater than median which is greater than mode
Negative distribution - Mean is less than median which is less than mode
First mark saying whether it is positive/negative, and second for validation - why?
Bar charts are more appropriate than pie charts, as data can be higher than 100%, but pie
charts only add up to 100%
o Pie chart not appropriate when the categories are not mutually exclusive
o When not mutually exclusive, the probability will exceed 1
Regression
Step 1:
Formulate null hypothesis (H0) and Alternative Hypothesis (H1)
H0: B(maintains) = 0
H1: B(maintains) > 0
Step 2:
t-stat = 1.66
Reject H0 if t-stat > t-critical
Step 3:
t-critical = 1.66, t-stat = 2.51
Step 4:
Decision
2.51 > 1.66
Sufficient evidence to reject H0
Don't know SD of the population so we use t-distribution
Everything is compared to zone 1
o If the B(zone2) is higher, it means that there's more yield in dummy variable, which is
zone 1
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