A fold shaped like an upside-down bowl is a(n) ________. 
Definitions:
Sample Mean
The average of a sample set of data, representing an estimate of the population mean.
Sampling Distribution
A distribution of a statistic obtained from a large number of samples drawn from a specific population.
Standard Deviation
A statistical metric that quantifies the spread or dispersion of a dataset relative to its mean, highlighting the variability within the data.
Population Mean
The average of all the values in a population, representing a central or typical value for the population.
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