How do you do longhand

(a) Write the claim mathematically and identify H0 and Ha.

(b) Find the critical value(s).

(c) Use the ?2-test to find the standardized test statistic. Draw the graph showing curve

Quarters are currently minted with weights normally distributed and having a standard deviation of 0.061. New equipment is being tested in an attempt to improve quality by reducing variation. A simple random sample of 26 quarters is obtained from those manufactured with the new equipment, and this sample has a standard deviation of 0.046. Use a 0.025 significance level to test the claim that quarters manufactured with the new equipment have weights with a standard deviation less than 0.061. Does the new equipment appear to be effective in reducing the variation of weights? (a) Write the claim mathematically and identify H, and He. O A. H: Gs0.061 (Claim); He : ( > 0.061 O B. H: 02 0.061; He : q 0.061 (Claim)