BUBBLE CHART:
A bubble chart is a good alternative to a bar chart that would need to include numerous bars. A bubble chart displays circles instead of bars, with each circle, or “bubble,” getting proportionally larger as the data size increases.
A bubble chart is a good alternative to a bar chart that would need to include numerous bars. A bubble chart displays circles instead of bars, with each circle, or “bubble,” getting proportionally larger as the data size increases.
Disadvantage: Bubble graphs are only visually useful when attempting to show relationships between multiple pieces of data.
source: http://captus.samhsa.gov/
sample size: is needed for choosing the number of observations or replicates to include in a statistical sample. the sample size is important feature of any empirical study in which the goal is to make inferences about a population from a sample.
confidence interval: is a measure of the reliability of an estimate. it is a type of interval estimate of a population parameter. how frequently the observed interval contains the parameter is determined by the confidence level or confidence coefficient.
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