Answered: Dr. Patton is a professor of English.…

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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Dr. Patton is a professor of English. Recently she counted the number of misspelled
words in a group of student essays. She noted the distribution of misspelled words
per essay followed the normal distribution with a population standard deviation of
2.44 words per essay. For her 10 a.m. section of 40 students, the mean number of

misspelled words was 6.05. Construct a 95% confidence interval for the mean num-
ber of misspelled words in the population of student essays.

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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