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 White Stripes singer Jack White are to record the theme for new James Bond film Quantum of Solace. Jack White and Alicia Keys will collaborate on the new James Bond film theme Photo: JOHN TAYLOR/PA. By Anita Singh, Showbusiness Editor. 11:24AM BST 30 Jul 2008.
Alternatively, perhaps Sammy Hagar is playing lead guitar on Right Now, both in studio and live. Also, there is a fairly lengthy keyboard bridge in the Van Halen classic Jump. Eddie's lead guitar is playing silmultaneous to the keyboard during the bridge. Again, EVH can record the keyboard and lead guitar parts separately for the album.