Which sets of curved arrows accounts for the protonation of propene with HI? 
Definitions:
Population Proportions
The fraction or percentage of the total number of individuals in a population that share a particular characteristic.
Pooled Proportion Estimate
A method for estimating the proportion of an entire population by combining the proportions from different samples.
Null Hypothesis
An initial assumption stating there is no meaningful difference or impact, serving as the basis for statistical analysis.
Pooled Proportion Estimate
A method for estimating the proportion of an attribute that is common to two or more groups.
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