A random sample of 10 GPA's from a 20 student class yielded a sample mean of 3.25 and a sample standard deviation of 0.8. Calculate the standard deviation for the sample mean or the standard error for this example.

There is a 1% chance that the stock market sees a 10% or greater reduction in 1 month. A random sample of 50 months over the last 50 years is collected. Is it appropriate to assume the sampling distribution for the sample proportion is distributed normally for this case? Explain.