a synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed usted with...
A synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. Let X = tensile strength of the synthetic fiber from a fiber specimen used in carpet manufacturing (in psi). Suppose you randomly pick a sample of n = 36 fiber specimens and perform tensile testing on them. (round 5 decimal places) a.) For n = 36 fiber specimens, what's the probability that the average tensile strength of all...
A synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. Suppose we measure the sample mean for n independent samples How is the variance of the sample mean changed when the sample size is increased from n-9 to n 36? What does this imply about the relationship between sample size and our estimate of the mean (sample mean here)?
7-5. A synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 520 KN/m² and standard deviation 25 KN/m². Find the probability that a ran- dom sample of n= 6 fiber specimens will have sample mean tensile strength that exceeds 525 KN/m².
7-5. A synthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 520 KN/m2 and standard deviation 25 KN/m2. Find the probability that a ran dom sample of n=6 fiber specimens will have sample mean tensile strength that exceeds 525 KN/m2 7-6. Consider th symtretie iber inr the previous exercise fHow
QUESTION 1 1 points Saved Copy of A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 36 tires and tested them to end-of life in a road test. The sample mean and standard deviation are 66 and 2.1 thousand kilometers. Find a 99% upper bound for the mean life in road test. (round the answer to three digits) 67.853 QUESTION 2 1 points Saved A synthetic fiber used in manufacturing...
Pr。Ыет 12. An engineer who is studying the tensile strength of a steel alloy intended for use in golf club shafts knows that tensile strength is approximately normally distributed. A random sample of 12 specimens has a mean tensile strength of 3250 psi and a sample standard deviation of 8-60 psi. a) Test the hypothesis that mean strength is 3500 psi. Use α-001. b) What is the smallest level of significance at which you coulji be willing to reject the...
The breaking strength of a certain rivet used in a machine engine is normally distributed with mean 5500 psi and standard deviation 307 psi. A random sample of 16 rivets is taken. What is the probability that the sample mean falls between 5456.25 psi and 5566.01 psi?
The fiber-spinning process currently produces a fiber whose strength is normally distributed with a mean of 75 N/m2 and a standard deviation of 8 N/m2. a. Find the probability that the strength of a randomly chosen fiber has a strength greater than 80 N/m2 b. Find the probability that the strength of a randomly chosen fiber has a strength between 71 N/m2 and 86 N/m2 c. Find the top 15% strongest fibers
An engineer studying the tensile strength of a composite material knows that tensile strength is approximately normally distributed with σ = 60 psi. A random sample of 20 specimens has a mean tensile strength of 3450 psi. (a) Test the hypothesis that the mean tensile strength is 3500 psi, using α = 0.01 (b) What is the smallest level of significance at which you would be willing to reject the null hypothesis? (c) What is the β error for the...
The comprehensive strength of concrete is normally distributed with u = 2500 psi and o = 50 psi. Find the probability that a random sample of n = 5 specimens will have a sample mean diameter that falls in the interval from 2499 psi to 2510 psi. Express the final answer to three decimal places (e.g. 0.987).