The Sample Standard Deviation of the Monthly Sales (In Thousands

Essay

The sample standard deviation of the monthly sales (in thousands of dollars)of a telecommunications firm in the United States for two years,2010 and 2011,is computed as 6.7.Assuming that the sales data are drawn from a normally distributed population,conduct the following hypothesis tests for the population variance.Use the critical value approach at α = 0.05.
a.H₀:σ₂ ≤ 25,H_A:σ² > 25
b.H₀:σ₂ = 36,H_A:σ² ≠ 36