Time shifting occurs when
a. clocks move ahead one hour in the spring
b. works are copied and kept for future generations
c. individuals copy works to view at a later time
d. copyrighted materials comes into the public domain

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47