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The greatest danger in cluster sampling is cluster specification error that occurs when the clusters are:
FICA Tax
A United States federal payroll tax that funds Social Security and Medicare, contributions are made by both employees and employers.
Social Security
A government system that offers financial assistance to people in the form of retirement benefits, disability income, and other payments.
Medicare
A federal health insurance program in the United States for people aged 65 and over, as well as for some younger people with disabilities.
Payroll Deductions
Amounts subtracted from an employee's gross salary for taxes, insurance premiums, benefits, and other payroll-related charges.
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