10.35 The dispersion, or variance, of haul times on aconstruction project is of great importance tothe project supervisor, because highly variablehaul times cause problems in scheduling jobs.The supervisor of the truck crews states thatthe range of haul times should not exceed 40minutes (The range is the difference betweenthe longest and shortest times.) Assumingthese haul times to be approximately normallydistributed, the project supervisor takes thestatement on the range to mean that the stan-dard deviation (o should be approximately10 minutes. Fifteen haul times are actuallymeasured and show a mean of 142 minutesand a standard deviation of 12 minutes. Canthe claim of (o = 10 be refuted at the 5% sig-nificance level?

Given data : sample size, n = 15 population standard deviation,σ= 10 sample…

Answered: statement on the range to mean that the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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statement on the range to mean that the stan- dard deviation (o should be approximately 10 minutes. Fifteen haul times are actually measured and show a mean of 142 minutes and a standard deviation of 12 minutes. Can the claim of (o = 10 be refuted at the 5% sig- nificance level?