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Name: The average cost for teeth straightening with metal braces is approxim
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Description: The average cost for teeth straightening with metal braces is approximately $5421. A nationwide franchise thinks that its cost is below that figure. A random sample of 28 patients across the country had an average cost of $5346 with a standard deviat

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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The average cost for teeth straightening with metal braces is approximately $5421. A nationwide franchise thinks that its cost is below that figure. A random sample of 28 patients across the country had an average cost of $5346 with a standard deviation of $630. At α=0.10, can it be concluded that the mean is less than $5421? Assume that the population is approximately normally distributed.

State the claim and identify the hypothesis. Tell whether it is a one tailed or two tailed test.

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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