Kevlar epoxy is a material used on the NASA space shuttles. Strands of this epoxy were tested at the 90% breaking strength. The following data represent time to failure (in hours) for a random sample of 50 epoxy strands. Let x be a random variablerepresenting time to failure (in hours) at 90% breaking strength.0.53 1.80 1.52 2.05 1.03 1.18 0.80 1.33 1.29 1.113.34 1.54 0.08 0.12 0.60 0.72 0.92 1.05 1.43 3.041.81 2.17 0.63 0.56 0.03 0.09 0.18 0.34 1.51 1.451.52 0.19 1.55 0.02 0.07 0.65 0.40 0.24 1.51 1.451.60 1.80 4.69 0.08 7.89 1.58 1.62 0.03 0.23 0.72USE SALT(a) Find the range.(b) Use a calculator to calculate Ex and Ex²Ex=Ex² =(c) Use the results of part (b) to compute the sample mean, variance, and standard deviation for the time to failure. (Round your answers to four decimal places.)x=$²=S=(d) Use the results of part (c) to compute the coefficient of variation. (Round your answer to the nearest whole number.)%What does this number say about time to failure?O The standard deviation of the time to failure is just slightly smaller than the average time.O The coefficient of variation says nothing about time to failure.O The standard deviation of the time to failure is just slightly larger than the average time.O The standard deviation is equal to the average.MY NOTESWhy does a small CV indicate more consistent data, whereas a larger CV indicates less consistent data? Explain.O A small CV indicates more consistent data because the value of s in the numerator is smaller.O A small CV indicates more consistent data because the value of s in the numerator is larger.ASK YOUR TEAC

Answer Given,The number of observations [n] =…

Answered: Kevlar epoxy is a material used on the…

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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c= 0.98, o=7.3, and E= 1 Assume that a preliminary sample has at least 30 me n3= (Round up to the nearest whole number.) %3D
Can a low barometer reading be used to predict maximum wind speed of an approaching tropical cyclone? For a random sample of tropical cyclones, let x be the lowest pressure (in millibars) as a cyclone approaches, and let y be the maximum wind speed (in miles per hour) of the cyclone. x 1,004 975 992 935 971 924 y 40 100 65 145 77 154 Use a calculator to verify that x = 5,801, x2 = 5,613,547, y = 581, y2 = 66,495 and xy = 554,778.Compute r. (Round your answer to four decimal places.)r = As x increases, does the value of r imply that y should tend to increase or decrease? Explain your answer.Given our value of r, y should tend to remain constant as x increases.Given our value of r, y should tend to decrease as x increases. Given our value of r, y should tend to increase as x increases.Given our value of r, we can not draw any conclusions for the behavior of y as x increases.
A process is monitored for defective items by taking a sample of 200 items each day and calculating the proportion that are defective. Let p; be the proportion of defective items in the ith sample. For the last 30 samples, the sum of the proportions is E P; = 1.64. Calculate the center line and the 30 upper and lower control limits for a p chart.
b?
A sample of 10 resistors gives the following (sorted) data in Kohms: 39.2 39.3 39.7 39.8 40.0 40.2 40.2 40.3 40.4 41.4 Find the interquartile range of the resistance data. 0.6 1.2 1.0 02.2 Not enough information is given.
Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 33 of the 38 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 94 of the 111 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects treated with echinacea and the second sample to be the sample of subjects treated with a placebo. What are the null and alternative hypotheses for the hypothesis test? O A. Ho: P1 #P2 Hy:P1 =P2 O B. Ho: P1 =P2 H1: P1 P2 H1: P1 #P2 Identify the test statistic. (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? the null hypothesis. There sufficient evidence to support the claim that echinacea…
Suppose the lengths of human pregnancies are normally distributed with µ = 266 days and o= 16 days. Complete parts (a) and (b) below. (Type integers or decimals.) A. The proportion of human pregnancies that last less than B. The proportion of human pregnancies that last more than days is days is Provide a second interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals.) O A. The probability that a randomly selected human pregnancy lasts less than B. The probability that a randomly selected human pregnancy lasts more than (b) The figure to the right represents the normal curve with µ = 266 days and o = 16 days. The area between x = 280 and x = 295 is 0.1558. Provide two interpretations of this area. days is days is Provide one interpretation of the area using the given values. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or…

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