Mathematics, 05.05.2020 07:18 cgarnett5408
An experiment was conducted to determine whether surface finish has an effect on the endurance limit of steel. There is a theory that polishing increases the average endurance limit (for reverse bending). From a practical point of view, polishing should not have any effect on the standard deviation of the endurance limit, which is known from numerous endurance limit experiments to be 4000 psi. An experiment was performed on 0.4% carbon steel using both unpolished and polished smooth-turned specimens. The data are as follows: Endurance Limit (psi) Polished Unpolished 0.4% Carbon 0.4% Carbon 85,500 82,600 91,900 82,400 89,400 81,700 84,000 79,500 89,900 79,400 78,700 69,800 87,500 79,900 83,100 83,400 Find a 95% confidence interval for the difference between the population means for the two methods, assuming
Answers: 1
Mathematics, 21.06.2019 14:00
Complete the truth table a. t, f, f, t b. t f f f c. f t f t d f t f t
Answers: 1
Mathematics, 21.06.2019 17:10
The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?
Answers: 1
Mathematics, 22.06.2019 00:30
Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16
Answers: 3
An experiment was conducted to determine whether surface finish has an effect on the endurance limit...
History, 18.10.2019 08:50
Chemistry, 18.10.2019 08:50
Chemistry, 18.10.2019 08:50
Mathematics, 18.10.2019 08:50
Chemistry, 18.10.2019 08:50
Chemistry, 18.10.2019 08:50
English, 18.10.2019 08:50
Geography, 18.10.2019 08:50
History, 18.10.2019 08:50
English, 18.10.2019 08:50
Mathematics, 18.10.2019 08:50