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.
Melissa Etheridge releases new song 'Pulse'. More Videos ... MUST WATCH. (CNN)I am human, I am love and my heart beats with my blood/Love will always win, underneath the skin, everybody's got a pulse, artist Melissa Etheridge sings in her tribute to the 49 people who died in the Orlando nightclub shooting.