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H.Ws: H.W1: A group of junior traffic engineers intended to examine speed characteristics of an urban arterial street. They collected a speed data of 150 vehicles using radar speed gun. Check whether their sample size was statistically adequate if the standard deviation of the speeds was ± 7 mph, the required confidence level was 99% (Z = 2.58), and the limit of acceptable error was ± 2 mph.

H.Ws: H.W1: A group of junior traffic engineers intended to examine speed characteristics of an urban arterial street. They collected a speed data of 150 vehicles using radar speed gun. Check whether their sample size was statistically adequate if the standard deviation of the speeds was ± 7 mph, the required confidence level was 99% (Z = 2.58), and the limit of acceptable error was ± 2 mph.

Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter4: Traffic Engineering Studies
Section: Chapter Questions
Problem 3P
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H.Ws: H.W1: A group of junior traffic engineers intended to examine speed characteristics of an urban arterial street. They collected a speed data of 150 vehicles using radar speed gun. Check whether their sample size was statistically adequate if the standard deviation of the speeds was ± 7 mph, the required confidence level was 99% (Z = 2.58), and the limit of acceptable error was ± 2 mph.
Transcribed Image Text:H.Ws: H.W1: A group of junior traffic engineers intended to examine speed characteristics of an urban arterial street. They collected a speed data of 150 vehicles using radar speed gun. Check whether their sample size was statistically adequate if the standard deviation of the speeds was ± 7 mph, the required confidence level was 99% (Z = 2.58), and the limit of acceptable error was ± 2 mph.
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