## How Strong are Durable Press Fabrics?"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength of the fabric. A study compared the breaking strength of fabrics treated by two commercial durable press processes. Five swatches of the same fabric were assigned at random to each process. Here are the data, in pounds of pull needed to tear the fabric:| Permafresh | 29.9 | 30.7 | 30.0 | 29.5 | 27.6 ||------------|------|------|------|------|------|| Hylite | 28.8 | 23.9 | 27.0 | 22.1 | 24.2 |### Questions1. **Is there good evidence that the two processes result in different mean breaking strengths?** (a) Do the sample means suggest that one of the processes is superior in breaking strength? (b) Make stemplots for both samples. The Permafresh sample contains a mild outlier. With just 5 observations per group, we worry that this outlier will affect our conclusions. (c) Test the hypothesis \( H_0: \mu_1 = \mu_2 \) against the two-sided alternative twice: once using all the data and again without the outlier in the Permafresh sample. Do the two tests lead to similar conclusions? Can we safely conclude that one treatment has significantly higher mean breaking strength than the other?

Given information:- Permafresh Hylite 29.9 28.8 30.7 23.9 30 27 29.5 22.1 27.6 24.2

Answered: 18.38 How strong are durable press…

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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In a study of exhaust emissions from school buses, the pollution intake by passengers was determined for a sample of nine school buses used in the Southern California Air Basin. The pollution intake is the amount of exhaust emissions, in grams per person, that would be inhaled while traveling on the bus during its usual 18-mile trip on congested freeways from South Central LA to a magnet school in West LA. Here are the amounts for the nine buses when driven with the windows open. 1.17 0.33 0.40 0.33 1.32 0.38 0.25 0.40 0.35 (a) Consider making a stemplot. Are there outliers or strong skewness that would preclude use of the t procedures? Which is correct? A. The sample is small and the stemplot is right skewed with possible outliers, so use of t procedures is not appropriate. b. The distribution is symmetric so use of t procedures is appropriate. c. The sample is small and the stemplot is left skewed with possible outliers, so use of t procedures is…
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