smooth curve|population|sample
Distribution Shapes
由直方图到 smooth curve
1.this distribution of heights is bell shaped(or mound shaped), but the smooth curve makes seeing the shape a little easier.
2.need not worry about minor differences in shape(全局),allows us to classify most distributions by designating
A distribution is unimodal if it has one peak; bimodal if it has two peaks; and multimodal if it has three or more peaks
Symmetric:are mirror images of one another
Key:Distinguishing between data for an entire population(census data.) and data for a sample of a population is an essential aspect of statistics.
The distribution of population data =the distribution of the variable
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