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Name: The manufacturer of the X-15 steel-belted redial truck tire claims tha
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Description: The manufacturer of the X-15 steel-belted redial truck tire claims that the mean mileage the tire can be driven before the tread wears out is at least 60,000 miles. Crosset Truck Company bought a sample of 48 tires and found that the mean mileage for

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 manufacturer of the X-15 steel-belted redial truck tire claims that the mean mileage the tire can be driven before the tread wears out is at least 60,000 miles. Crosset Truck Company bought a sample of 48 tires and found that the mean mileage for its trucks is 59,000 miles (i.e. less than the manufacturer’s claim) with a standard deviation of 5,000 miles.

4) Another engineer has argued that tiers are considered to be fully consumed after 120000 mileage, test this claim at significance level of 10%.

5) If the manager of a store is thinking about establishing a new billing system for the store's credit costumers. After a thorough financial analysis, she determines that the new system will be cost effective only if the mean monthly income is more than 170£. A random sample of 400 monthly accounts is drawn, for which the sample mean is 178£. The manager knows that the accounts are normally distributed with standard deviation of 65£. Can the manager conclude from this that the new system will be cost-effective at significance level (α) equals 5%.?

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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