A weight W is hanging from a light vertical string. If a second weight W is added without stretching the string, the speed of pulses on this string will now be twice as great as it originally was. a. True b. False

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