Answered: Manager at private financial company.…

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter9: Solving Quadratic Functions

Section: Chapter Questions

Problem 4CA

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Manager at private financial company. She wishes to compare the productivity, as measured
by the number of customers served, among three employees. Four days are randomly selected
and the number of customers served by each employee is recorded. The results are:
David Amanda Rosa
55 66 47
54 76 51
59 67 46
56 71 48
Note that the populations follow the normal distribution and the variation in each population is
the same. However, the population means are not the same. Test at α =0.05 if there a difference
in the mean number of customers served?

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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