Hey guys,
I have this question and I am clueless about how to solve it. Any help is appreciated
Thanks!

In a microarray experiment replicas show that the logarithm (base 2) of fold changes have a mean of zero, a standard deviation of 0.5 and obey a Gaussian distribution.
a. Is a fold change of more than 2 statistically significant (error threshold a=5%)?
b. Is a fold change of 2 also highly significant (a=1%)?