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 | :: MC Mock_Exam - Q1 :: | |
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All rights reserved. The non-commercial (academic) use of this software is free of charge. The only thing that is asked in return is to cite this software when results are used in publications.
Click here to edit the underlying code of this R Module.Click here to edit the underlying code of this R Module.
Click here to edit the underlying code of this R Module.
| Source code of R module | | 1 | library(digest) | | 2 | myran <- runif(1) | | 3 | if (myran <= 1) { | | 4 | nx1 <- rnorm(100) | | 5 | nx2 <- rnorm(100, sd=2.0, mean=0.0) | | 6 | nx3 <- rnorm(100, sd=2.0, mean=-2.0) | | 7 | answer <- "nx1" | | 8 | } | | 9 | if (myran < 0.66) { | | 10 | nx2 <- rnorm(100) | | 11 | nx3 <- rnorm(100, sd=2.0, mean=0.0) | | 12 | nx1 <- rnorm(100, sd=2.0, mean=-2.0) | | 13 | answer <- "nx2" | | 14 | } | | 15 | if (myran < 0.33) { | | 16 | nx3 <- rnorm(100) | | 17 | nx1 <- rnorm(100, sd=2.0, mean=0.0) | | 18 | nx2 <- rnorm(100, sd=2.0, mean=-2.0) | | 19 | answer <- "nx3" | | 20 | } | | 21 | answer <- digest(answer,ser=F) | | 22 | allmeans<- c(mean(nx1),mean(nx2),mean(nx3)) | | 23 | names(allmeans)<-c("Sample 1", "Sample 2", "Sample 3") | | 24 | allmeans | | 25 | allsd<- c(sd(nx1), sd(nx2), sd(nx3)) | | 26 | names(allsd)<- c("Sample 1", "Sample 2", "Sample 3") | | 27 | allsd | | 28 | load(file="createtable") | | 29 | a<-table.start() | | 30 | a<-table.row.start(a) | | 31 | a<-table.element(a,"Identify the sample most similar to a standard normal distribution.",1,TRUE) | | 32 | a<-table.row.end(a) | | 33 | a<-table.row.start(a) | | 34 | a<-table.element(a,hyperlink(paste("http://www.wessa.net/Ian.Holliday/rwasp_May_mock2.wasp?par1=",par1,"&par2=nx1&par3=",answer,"&par0=1",sep=""),"The sample called nx1","",target="")) | | 35 | a<-table.row.end(a) | | 36 | a<-table.row.start(a) | | 37 | a<-table.element(a,hyperlink(paste("http://www.wessa.net/Ian.Holliday/rwasp_May_mock2.wasp?par1=",par1,"&par2=nx2&par3=",answer,"&par0=1",sep=""),"The sample called nx2","",target="")) | | 38 | a<-table.row.end(a) | | 39 | a<-table.row.start(a) | | 40 | a<-table.element(a,hyperlink(paste("http://www.wessa.net/Ian.Holliday/rwasp_May_mock2.wasp?par1=",par1,"&par2=nx3&par3=",answer,"&par0=1",sep=""),"The sample called nx3","",target="")) | | 41 | a<-table.row.end(a) | | 42 | a<-table.row.start(a) | | 43 | a<-table.element(a,hyperlink(paste("http://www.wessa.net/Ian.Holliday/rwasp_May_mock2.wasp?par1=",par1,"&par2=wnga&par3=",answer,"&par0=1",sep=""),"Avoid Guessing Penalty","",target="")) | | 44 | a<-table.row.end(a) | | 45 | a<-table.end(a) | | 46 | table.save(a,file="mytable1.tab") | | 47 | a<-table.start() | | 48 | a<-table.row.start(a) | | 49 | a<-table.element(a,"Means of the three samples",4,TRUE) | | 50 | a<-table.row.end(a) | | 51 | a<-table.row.start(a) | | 52 | a<-table.element(a,"Sample",1,TRUE) | | 53 | a<-table.element(a,"nx1",1,TRUE) | | 54 | a<-table.element(a,"nx2",1,TRUE) | | 55 | a<-table.element(a,"nx3",1,TRUE) | | 56 | a<-table.row.end(a) | | 57 | a<-table.row.start(a) | | 58 | a<-table.element(a,"Value",1,TRUE) | | 59 | a<-table.element(a,round(mean(nx1),3)) | | 60 | a<-table.element(a,round(mean(nx2),3)) | | 61 | a<-table.element(a,round(mean(nx3),3)) | | 62 | a<-table.row.end(a) | | 63 | a<-table.end(a) | | 64 | table.save(a,file="mytable2.tab") | | 65 | a<-table.start() | | 66 | a<-table.row.start(a) | | 67 | a<-table.element(a,"Standard deviations of the three samples",4,TRUE) | | 68 | a<-table.row.end(a) | | 69 | a<-table.row.start(a) | | 70 | a<-table.element(a,"Sample",1,TRUE) | | 71 | a<-table.element(a,"nx1",1,TRUE) | | 72 | a<-table.element(a,"nx2",1,TRUE) | | 73 | a<-table.element(a,"nx3",1,TRUE) | | 74 | a<-table.row.end(a) | | 75 | a<-table.row.start(a) | | 76 | a<-table.element(a,"Value",1,TRUE) | | 77 | a<-table.element(a,round(sd(nx1),3)) | | 78 | a<-table.element(a,round(sd(nx2),3)) | | 79 | a<-table.element(a,round(sd(nx3),3)) | | 80 | a<-table.row.end(a) | | 81 | a<-table.end(a) | | 82 | table.save(a,file="mytable3.tab") | | 83 | bitmap(file="hist1.png") | | 84 | hist(nx1) | | 85 | dev.off() | | 86 | bitmap(file="hist2.png") | | 87 | hist(nx2) | | 88 | dev.off() | | 89 | bitmap(file="hist3.png") | | 90 | hist(nx3) | | 91 | dev.off() | | 92 | bitmap(file="pairs.png") | | 93 | pairs(x=cbind(nx1, nx2, nx3)) | | 94 | dev.off() |
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| Cite this software as: | | I. Holliday, 2010, MC Exam Q1 (v1.0) in Free Statistics Software (v1.1.23-r6), Office for Research Development and Education, URL http://www.wessa.net/Ian.Holliday/rwasp_mcq20101.wasp/ | | | The R code is based on : | | | | | | | | | | | | | | | |
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To cite Wessa.net in publications use:
Wessa, P. (2013), Free Statistics Software, Office for Research Development and Education,
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