Before agreeing to purchase a large order of polyethylene sheaths for a particular type of high-pressure oil-filled submarine power cable, a company wants to see conclusive evidence that the true standard deviation of sheath thickness is less than 0.05 mm. What hypotheses should be tested, and why

Step-by-step explanation:

To help the company achieve a true standard deviation of sheath thickness is less than 0.05 mm, the company should test the hypothesis that

Null hypothesis: standard deviation of sheath thickness is greater than or equal to 0.05 mm

While the alternative hypothesis: standard deviation of sheath thickness is less than 0.05 mm.

Making such hypotheses enable us to be able to find conclusiveevidence against the null hypothesis to either reject or to fail to reject the null hypothesis

no not all of them.

step-by-step explanation:

some of them have a square base.

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.