In a Study of the Relationship Between Birth Order and College

question 138

Essay

In a study of the relationship between birth order and college success, an investigator found that 140 in a sample of 200 college graduates were firstborn or only children. In a sample of 120 non-graduates of comparable age and socioeconomic background, the number of firstborn or only children was 66. Estimate the difference between the proportions of firstborn or only children in the two populations from which these samples were drawn. Use a 90% confidence interval and interpret your results.
The approximate 90% confidence interval is:
______________
Based on the interval above, is there a difference between the proportions of firstborn or only children in the two populations?
______________
Explain.
________________________________________________________

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Definitions:

Profits

The financial gain obtained when the amount of revenue gained from a business activity exceeds the expenses, costs, and taxes involved in sustaining the activity.

Firms

Business organizations involved in the production and sale of goods and services.

Payroll Tax

Taxes imposed on employers and employees, calculated as a percentage of the salaries that employers pay to their staff.

Regressive

A term typically used to describe tax systems that take a smaller percentage of income as income increases, disproportionately affecting lower-income earners.