The shear strength of each of ten test spot welds is determined, yielding the following data...
The shear strength of each of ten test spot welds is determined, yielding the following data (psi). 364 415 389 367 375 358 409 362 375 365 (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 psi standard deviation psi (b) Again assuming a normal distribution, estimate the strength value below which 95% of all...
The shear strength of each of ten test spot welds is determined, yielding the following data (psi). 389 382 415 390 362 375 358 409 388 367 (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 standard deviation (b) Again assuming a normal distribution, estimate the strength value below which 95% of all welds will...
The shear strength of each of ten test spot welds is determined, yielding the following data (psi). 409 415 362 375 367 389 398 403 387 358 The shear strength of each of ten test spot welds is determined, yielding the following data (psi) 409 415362 375 367389 398 403 387 358 (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...
The shear strength of each of ten test spot welds is determined, yielding the following data (psi). 362 415 358 396 375 389 367 371 409 385 (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 382.70 psi standard deviation (b) Again assuming a normal distribution, estimate the strength value below which 95% of all...
The shear strength of each of ten test spot welds is determined, yielding the following data (psi). 409 393 358 361 367 362 374 389 375 415 (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 380.3 psi standard deviation psi (b) Again assuming a normal distribution, estimate the strength value below which 95% of...
Shear strength measurements for spot welds have been found to have standard deviation 10 pounds per square inch(psi). (a): If 100 test welds are to be measured, what is the approximate probability that the sample mean will be within 1 psi of the true population mean? (b): If we want the difference between the sample mean to be within 1 psi of the true population mean, with probability of 0.9, how many test welds need to be measured?
The accompanying data resulted from an experiment in which weld diameter x and shear strength y (in pounds) were determined for five different spot welds on steel. A scatterplot shows a pronounced linear pattern. The least-squares line is -940.908.60x. Because 1 lb 0.4536 kg, strength observations can be re-expressed in kilograms through multiplication by this conversion factor: new y = 0.4536(old y), what is the equation of the least-squares line when y is expressed in kilograms? (Give the answer to...
As concrete cures, it gains strength. The following data represent the 7-day and 28-day strength in pounds per square inch (psi) of a certain type of concrete. Complete parts (a) through (f) below. 7-Day Strength (psi), x 3340 3380 3330 2300 2480 28-Day Strength (psi), y 4630 5020 4850 4070 4120 (a) Treating the 7-day strength as the explanatory variable, x, use technology to determine the estimates of beta 0 and beta 1. beta 0almost equalsb 0equals nothing (Round to...
As concrete cures, it gains strength. The following data represent the 7-day and 28-day strength in pounds per square inch (psi) ofa certain type of concrete. Complete parts (a) through (f) below. 7-Dy Strength (psi)x 33802620 3390 2300 3330 4070 4850 28-Day Strength (psi,y 4190 (a) Treating the 7-day strength as the explanatory variable, use technology to determine the estimates of Po and pl P 1753.9 (Round to one decimal place as needed.) P sb9707 (Round to four decimal places...
As concrete cures, it gains strength. The following data represent the 7-day and 28-day strength in pounds per square inch (psi) of a certain type of concrete. Complete parts (a) through (f) below. 7-Day Strength (psi), x 3340 3380 3330 2300 2480 28-Day Strength (psi), y 4630 5020 4850 4070 4120 (a) Treating the 7-day strength as the explanatory variable, x, use technology to determine the estimates of beta 0 and beta 1. beta 0almost equalsb 0equals nothing (Round to...