What is the value of z score required for a 70% confidence interval?
find the midrange for the given sample data.
1.5 2.5 3.0 1.2 1.3 3.8 1.8 3.3 2.3 2.9 1.8
What is the z-score that corresponds to the 20th percentile of the normal distribution
Will the t statistics calculated from 4 observations valid?