Computers and Technology

Computers and Technology, 26.07.2019 00:40, diyah843

What is a common method for testing a spot weld?

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Mathematics, 27.06.2019 21:30, aaronolivera200161

The shear strength of each of ten test spot welds is determined, yielding the following data (psi): 410 358 367 375 393 415 375 409 389 362 (a) assuming that shear strength is normally distributed, estimate the true average shear strength and standard deviation of shear strength using the method of maximum likelihood. (round your answers to two decimal places.) average 385.3 standard deviation 19.91 (b) again assuming a normal distribution, estimate the strength value below which 95% of all welds will have their strengths. [hint: what is the 95th percentile in terms of µ and s? now use the invariance principle.] (round your answer to two decimal places.) (c) suppose we decide to examine another test spot weld. let x = shear strength of the weld. use the given data to obtain the mle of p(x ≤ 400). [hint: p(x ≤ 400) = φ((400 − μ)/s).] (round your answer to four decimal places.)

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Mathematics, 23.09.2019 00:00, zairamori14

To determine whether the pipe welds in a nuclear power plant meet specifications, a random sample of welds is selected, and tests are conducted on each weld in the sample. weld strength is measured as the force required to break the weld. suppose the specifications state

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Mathematics, 02.10.2019 05:30, missmontgomery21

Aresearcher compares the effectiveness of two different instructional methods for teaching anatomy. a sample of 175 students using method 1 produces a testing average of 89.6. a sample of 177 students using method 2 produces a testing average of 68.8. assume the standard deviation is known to be 17.56 for method 1 and 5.07 for method 2. determine the 98% confidence interval for the true difference between testing averages for students using method 1 and students using method 2.

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Mathematics, 23.10.2019 22:00, teamzomaxx6584

Aresearcher compares the effectiveness of two different instructional methods for teaching anatomy. a sample of 66 students using method 1 produces a testing average of 54.9. a sample of 110 students using method 2 produces a testing average of 85.9. assume that the population standard deviation for method 1 is 6.04, while the population standard deviation for method 2 is 16.44. determine the 99% confidence interval for the true difference between testing averages for students using method 1 and students using method 2. step 1 of 3 : find the point estimate for the true difference between the population means.

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