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It is desired to estimate the mean tensile strength for roof hangers. It is known that the standard deviation of measurements of tensile strength is

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It is desired to estimate the mean tensile strength for roof hangers. It is known that the standard deviation of measurements of tensile strength is 0.25. (Units are Newton per square meter.) As it is very important for safety, the 99% confidence interval needs to have a margin smaller than 0.04. What is the minimum required sample size? O a. 85 O b. 261 O c. 116 O d. 463 O e. 167

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