Mathematics, 30.11.2019 03:31 vittoriochavez9700
In a test of the effect of dampness on electric connections, 100 electric connections were randomly tested under damp conditions and 150 were randomly tested under dry conditions. twenty of the damp connections failed and 18 of the dry ones failed. assume the testing conditions are independent. the data are summarized in the following contingency table. failed passed damp 20 80 dry 18 132 source: navidi, m. (2008). statistics for engineers and scientists. new york, ny: mcgraw-hill. report (in standard notation) and interpret a 90% confidence interval for the difference between the true proportions of connections that failed when damp as opposed to when dry. using the 90% confidence interval, can you conclude that the true proportion of connections that fail when damp is significantly different than the true proportion of connections that fail when dry? 1. label the parameters: a. let p be the true proportion of connections that fail when damp. b. let p be the true proportion of connections that fail when dry. 2. propose an appropriate confidence interval: 3. verify the required conditions for the proposed confidence interval: a. independence and randomization assumption: b. normality assumption:
Answers: 2
Mathematics, 21.06.2019 19:00
Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?
Answers: 3
Mathematics, 21.06.2019 21:00
Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.
Answers: 1
Mathematics, 21.06.2019 21:50
Question 14 (1 point) larry deposits $15 a week into a savings account. his balance in his savings account grows by a constant percent rate.
Answers: 3
Mathematics, 21.06.2019 22:30
Abucket of paint has spilled on a tile floor. the paint flow can be expressed with the function p(t) = 6(t), where t represents time in minutes and p represents how far the paint is spreading. the flowing paint is creating a circular pattern on the tile. the area of the pattern can be expressed as a(p) = 3.14(p)^2 part a: find the area of the circle of spilled paint as a function of time, or a[p(t)]. show your work. part b: how large is the area of spilled paint after 8 minutes? you may use 3.14 to approximate pi in this problem.
Answers: 2
In a test of the effect of dampness on electric connections, 100 electric connections were randomly...
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