Question

The 95% confidence interval for the variance and standard deviation for the sugar content in an ice cream (in mg) if the sample of nine servings has a variance of 36. Explain the steps

Answer 1

From the confidence interval find the

Z score which is 1.96

From the formula of calculating the z score

Z = (X_i-μ)/δ

From the formula standard deviation and variance can be easily found

Standard deviation is 6