Question

Suppose that a steel manufacturing company wishes to know whether the tensile strength of the steel wire has an overall average of 120 pounds. A sample of 25 units of steel wire produced by the company yields a mean strength of 110pounds and a variance of 144 pounds. Should the company conclude that the strength is not 120 pounds with α=0.05? Obtain a 95% confidence interval for the true mean.​

Answer 1

Answer:

Definition. A polynomial is an expression that can be built from constants and symbols called variables or indeterminates by means of addition, multiplication and exponentiation to a non-negative integer power. ... That is, a polynomial can either be zero or can be written as the sum of a finite number of non-zero terms.