This is a statistics and probability question.(adsbygoogle = window.adsbygoogle || []).push({});

I've been trying to figure this out for hours but I'm getting nowhere:

I have to test the hypothesis that the true average value of a sample is 6.2. I will reject the null hypothesis if with 95% confidence if the true average value is indeed 6.2 or reject the null hypothesis if the true average is 6.0.

I need to calculate the number of samples needed to test the hypothesis with the required accuracy, as well as the cut-off level, assuming a standard deviation of 0.4.

I have never done a problem where average value or sample size wasn't given, any help on how to get started would be greatly appreciated

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Determining sample size needed to test hypothesis

**Physics Forums | Science Articles, Homework Help, Discussion**