Remember that we already learned about the standard error .... The standard error of the sample mean is given by the following equation: $$\sigma_\bar{y} = \frac{\sigma}{\sqrt{n}} $$. In the above equation, $\sigma$ is the population standard deviation. But like $\mu$, $\sigma$ is an unknown parameter.
Alicia Keys and and Jack White to Sing Quantum of Solace Theme Song. The news does not come as a shock to Bond fans, as Universal Exports first reported the possibility of Alicia Keys singing the Quantum of Solace theme song back on July 11, 2008.
Before the announcement that White and Keys would sing the ditty, the Quantum of Solace theme song rumor mill was just as rampant as those for previous movies. It briefly came to an end, with troubled musician Amy Winehouse apparently having been chosen, if not signed, to sing the tune.