Consider a sampling distribution formed based on n = 3.The standard deviation of the population of all sample means 
is ______________ less than the standard deviation of the population of individual measurements σ.
Definitions:
Exposure
refers to the contact with a disease-causing factor or the amount of the factor that impinges upon a person or group.
Incidence Rate Ratio
A measure used in epidemiology to compare the rate of occurrence of new cases of a disease or condition between two study populations over a specific time period.
Population Proportion Attributable Risk
The proportion of incidents in the population that are due to the risk factor, helping in understanding the public health impact of the factor.
Cohort Study
A research method that follows a group of people over time to study their exposures and the subsequent outcomes.
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