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Statistics course and homework discussion. Elementary statistics.enMon, 27 Feb 2017 10:47:24 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - Statistics
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Basic probability help
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Sun, 26 Feb 2017 23:01:56 GMTMechanical Engineering reported on the need for wireless networks to monitor the quality of industrial equipment. For example, consider Eaton Corp.,...Mechanical Engineering reported on the need for wireless networks to monitor the quality of industrial equipment. For example, consider Eaton Corp., a company that develops distribution products. Eaton estimates that 90% of the electrical switching devices it sells can monitor the quality of the power running through the device. Eaton further estimates that of the buyers of electrical switching devices capable of monitoring quality, 90% do not wire the equipment up for that purpose. Use this info to estimate the probability that an Eaton electrical switching device is capable of monitoring power quality and is wired up for that purpose.

I know that if you define the two events as A and B,
P (A) = .9
P (B/A) = .9

And I think the last part of the question is asking for P(A and complement of B), but from there I cannot figure out how to deduce what the probability of B is. I just can't figure out an equation that would work.

Thank you!
]]>Statisticsbeccaspendshttp://www.talkstats.com/showthread.php/68802-Basic-probability-helpHelp its urgent!
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Sun, 26 Feb 2017 20:27:36 GMTQ1)A certain stimulus administrated to each of the nine patients resulted in the following increase in blood pressure:
5,1,8,0,3,3,5,-2,4
Can it be...Q1)A certain stimulus administrated to each of the nine patients resulted in the following increase in blood pressure:
5,1,8,0,3,3,5,-2,4
Can it be concluded that blood pressure in general is increased by administrating the stimulus?

Q2)A manufacturer of house dresses sent out advertising by mail. He spent samples of material to each of two groups of 1000 women. For one group he enclosed a white return envelop and for the other group, a blue envelop. He recieved order from 9% and 12% respectively. Is it quite certain that the blue envelop will help sales? Use :shakehead = 0.05.

Please solve these with explanation thanx alot in advance. :yup:
]]>StatisticsIfailedinstatshttp://www.talkstats.com/showthread.php/68801-Help-its-urgent!standard error of quadratic estimate
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Sun, 26 Feb 2017 18:51:11 GMTHi all,
I want to estimate the value of an independent variable X (temperature in F) that maximized my dependent variable Y (pressure in bars)....Hi all,

I want to estimate the value of an independent variable X (temperature in F) that maximized my dependent variable Y (pressure in bars). When using regression and fitting the model that includes the quadratic form of X (X2), I get an estimate (X2=-0.054 std err=0.0002). Calculating the derivative I found that Y was maximized at x=23 F.

My problem is that I need to report a std error.
Should I report the std error of the quadratic estimate? Is there a meaningful std error associated with the value I calculated in the same units (F)?
I would expect something like std error=1.4 F.

I hope my question makes sense.
Thank you
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