Genetic Variation

Question

LESSON 10
Analyzing Data About Traits
A statistician collects the following height data in inches for a school district. The statistician says that it is a normal distribution. How did they draw this conclusion?
(1 point)
• The frequencies for each height range are different.
• When graphed, the data creates a bell curve
• The frequencies for the first and last height range are the same.
• When graphed, the data creates a straight line

Answer 1

The correct answer is: When graphed, the data creates a bell curve.

A normal distribution, also known as a bell curve, is characterized by the shape of the data when graphed. In a normal distribution, the frequencies of data points are highest at the center and gradually decrease as you move towards the extreme values. The shape of the distribution resembles a symmetrical bell shape, hence the term "bell curve." Therefore, if the data when graphed creates a bell curve pattern, it indicates a normal distribution.