The Owens Corning company wishes to estimate the mean heat loss of its 4x1 commercial grade fiberglass pipe insulation when the pipe is operating at 300 F. What sample size should they use in their study, if they wish to keep their margin of error to no more than 0.75 F at a 95% level of confidence? Assume that the standard deviation for heat loss for this material under these conditions is at most 2.0 F. On = 300 On = 28 %3D On = 196 On = 75

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