Help

D Question 1 3 pts Question 1: Lecture Notes 7 Example: Corrosion Resistant Steel To investigate the corrosion-resistance properties of a new, more cheaply made type of steel conduit, 16 specimens are buried in soil for a 2-year period. The maximum depression (in mils) for each specimen is then measured. The currently used steel conduit is thought to have mean maximum depression (in mils) of Ho = 50 mils. Does this new type of steel conduit appear to have a different mean maximum depression? b. What hypotheses can be used to test the question of interest? [ Select ] V (i). Ho x = 50, HAX # 50 (ii) Ho x # 50, HAX = 50 (iii). Ho u # 50, HAM = 50 (iv) Ho u = 50, HAM # 50 c1. Which of the following describes a Type 1 error for these hypotheses? [ Select ] (i) The sample mean observed is very far from 50 mils, so our testing strategy rejects the null. A measurement of all maximum depressions on this type of conduit has a mean measurement of 50 mils. (ii) The sample mean observed is very far from 50, so our testing strategy rejects the null. A measurement of all maximum depressions on this type of conduit has a mean measurement of 55 mils. (iii) The sample mean observed is very close to 50, so our testing strategy retains the null. A measurement of all maximum depressions on this type of conduit has a mean measurement of 50 mils. (iv) The sample mean observed is very close to 50, so our testing strategy retains the null. A measurement of all maximum depressions on this type of conduit has a mean measurement of 55 mils. c2. How do we protect ourselves against making type 1 errors? [Select ]