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Sample Proportions
Approximately normal if
np > eq 10
nq > eq 10
Sample Means
Approximately notmal if the original population distribution is approx. normal AND/OR n> eq 30
Sample proportions ten percent condition
Can use standard dev formula if 10n< eq N (entire pop) to find out spread
Larger samples give smaller spread
Sample mean ten percent condition
To find out spread , can use formala if 10n< eq N (entire pop)
