Distribution of the sum of independent
The distribution of the sum of independent N(?, ?2) random variables is:
a. always approximately normal
b. always exactly normal
c. usually approximately normal
d. usually exactly normal e. sometimes approximately normal
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McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the minimum sample size. Is this sample size practical?
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Consider a harmonic oscialltor of mass m under a restoring force -kx and damping force -bx. It is displaced at +A and then released with zero velocity. Find the equation representing the underdamped, critically damped, and overdamped motions.
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