If We Compare an Elliptical Galaxy and a Spiral Galaxy

question 122

Multiple Choice

If we compare an elliptical galaxy and a spiral galaxy of the same mass 1 billion years after both began formation,

• A) they should each have about the same number of stars.
• B) the elliptical galaxy will have formed more stars than the spiral.
• C) the spiral galaxy will have formed more stars than the elliptical.
• D) neither galaxy will have formed any stars during the first billion years.

---

Definitions:

Variance

A measure of the dispersion or spread of a set of data points in a data set, representing the average squared deviation from the mean.

Standard Normal

A normal distribution with a mean of zero and a standard deviation of one, commonly used in statistical analyses.

Mean

The arithmetic average of a set of values or measurements, calculated by summing them all up and dividing by the number of values.

Standard Deviation

A statistic that measures the dispersion or variability of a set of data points relative to its mean.