Answered: Last Wednesday, a random sample of 12…

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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Last Wednesday, a random sample of 12 students were surveyed to find how long it
takes to walk from the Fretwell building to the College of Education building. The
survey team found a sample mean of 10 minutes with a standard deviation of 2.5 minutes. Assuming walking times from Fretwell to the College of Education are normally distributed, Which of the following is a 90% confidence interval for the population mean of walking times? (round to two decimal numbers)

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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