# Hypothesis Testing help/ please show work

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• Apr 11th 2011, 06:54 PM
jgjimcat
Hypothesis Testing help/ please show work
A random sample of 100 observations was taken from the population. The mean of the sample is 400, and standard error is 10. What is the estimated mean and standard deviation of the population?
• Apr 11th 2011, 07:04 PM
pickslides
The standard error is $\displaystyle \frac{s}{\sqrt{n}}$

In your case $\displaystyle \frac{s}{\sqrt{100}}= 10$ solve for $s$
• Apr 11th 2011, 07:54 PM
Sambit
And the mean will be same as that of the sample.