Answered: random sample of 15 ECE graduates of a…

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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Question

A random sample of 15 ECE graduates of a certain school design a
schematic diagram of a given electronic system with an average time of 2
hrs with a standard deviation of 20 minutes. Assuming a normal
distribution for the time to finish the design of the schematic diagram,

a. find a 99% confidence interval for the average time to finish the
design of the schematic diagram by all ECE graduates of this school.

b. Compute the 99% prediction interval for the next observed time to
finish the design of the schematic diagram by a graduate of this
schoo

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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