A Research Firm Wants to Compute an Interval Estimate with 90

question 9

Multiple Choice

A research firm wants to compute an interval estimate with 90% confidence for the mean time to complete an employment test. Assuming a population standard deviation of three hours,what is the required sample size if the error should be less than a half hour?

• A)196
• B)98
• C)10
• D)16

---

Definitions:

Developmental Psychology

The scientific study of how and why human beings change over the course of their life, from infancy through to old age.

Sociobiology

A field of study that examines social behavior from an evolutionary perspective, understanding complex social behaviors through biological principles.

Marilyn Mach Vos Savant

An American magazine columnist, author, lecturer, and playwright who has earned a place in the Guinness World Records under "Highest IQ."

Intelligence Test Score

A numerical representation derived from standardized assessments designed to measure human intelligence and cognitive abilities.