The Maximum Distance at Which a Highway Sign Can Be

Multiple Choice

The maximum distance at which a highway sign can be read is determined for a sample of young people and a sample of older people. The mean distance is computed for each age group. What's the most appropriate null hypothesis about the means of the two groups?

A) The population means are different.
B) The sample means are different.
C) The population means are the same.
D) The sample means are the same.