Leap-Year Corrections in the Calendar Are Necessary to Account for The

question 167

Multiple Choice

Leap-year corrections in the calendar are necessary to account for the:

• A) fact that the actual rotation time of Earth with respect to the stars is not exactly 24 hours.
• B) wobble of Earth's axis.
• C) slow drift in the direction of Earth's spin axis.
• D) fact that one year is not exactly 365 days.

---

Definitions:

Selection Bias

A distortion in statistical analysis resulting from the method of collecting samples, leading to an unrepresentative sample and misleading results.

Cohort Study

An observational study in which a defined group of people (the cohort) is followed over time to study the incidence of disease or various outcomes.

Asbestos

A group of naturally occurring fibrous minerals known for their resistance to heat, chemicals, and electricity, historically used in construction but hazardous to health.

Incidence Rate

A measure of the frequency at which new cases of a disease or condition occur in a population over a specified period.