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Free statistics help forum. Discuss statistical research, data analysis, statistics homework questions, R, SAS, Stata, SPSS, and more.enMon, 27 Feb 2017 08:18:53 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum
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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!Need help selecting appropriate test
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Sun, 26 Feb 2017 19:38:46 GMTI'm currently trying to select the appropriate significance test and test of association and would really appreciate some help.

My independent variable is an ordinal subjective risk assessment (1-4) and the dependent is continuous (amount of data shared). I have yet to determine if I can use parametric stats, but as of yet the distribution does not appear normal, nor is variance homogeneous.
I would like to determine the strength of association between risk assessment and data shared. I would also like to determine whether or not those in each risk assessment category vary from one another. I therefore likely won't be able too use anova.

I had thought about using a chi-square, but chi-square does not take into account the rank. I also don't want to split my dependent variable into categories if I don't have to. I had also considered Spearman's Rho for the strength of association.

Am I thinking about this all wrong? Any help would be greatly appreciated.
What is the correct statistical technique when using ordinal predictor variables and continuous outcome variables.
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