Answered: Listed in the accompanying table are…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 4CYU

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Question

Listed in the accompanying table are waiting times (seconds) of observed cars at a Delaware inspection station. The data from two waiting lines are real observations, and the data from the single waiting line are modeled from those real observations. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b).

One Line	Two Lines
64.1	733.6	64.3	865.2
157.2	605.8	215.8	1089.7
142.2	267.8	85.6	662.7
278.9	310.2	339.6	518.1
253.2	128.8	199.5	565.6
475.7	132.9	630.3	268.2
478.2	122.1	333.1	350.4
473.5	128.9	328.9	95.2
402.1	232.7	914.6	99.7
721.6	461.2	552.8	162.7
760.7	482.2	596.7	100.6
692.3	518.1
837.1	508.5
903.1	580.2

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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