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Experimental Design: Problem Set

June 21, 2012

By Al-Ahmadgaid Asaad

QUESTIONS

The tensile strength of Portland cement is being studied. Four different mixing techniques can be used economically. The following data have been collected:

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My On-Job Training Analytics

May 22, 2012

By Al-Ahmadgaid Asaad

I have been working at Provincial Statistics Office of Tawi-Tawi (Philippines) which was part of the training on my OJT (On-Job Training). One of the requirements of the training is at least 80 hours of services, so I decided to work from April 19 to M...

Average Annual Population Growth Rate of Tawi-Tawi

May 19, 2012

By Al-Ahmadgaid Asaad

Average Annual Population Growth Rate of Tawi-Tawi

R Codeslibrary(ggplot2) TawiTawiGrowthRate <- as.numeric(c(2.6, 3.3, 5.9, 1.6, 1.8, 5.5, 5))CensalYear <- c("1948-1960","1960-1970","1970-1980","1980-1990","1990-1995","1995-2000","2000-2007") qplot(CensalYear, TawiTawiGrowthRate, xlab ...

Population of Iligan City from 1970 to 2010

May 16, 2012

By Al-Ahmadgaid Asaad

Population of Iligan City from 1970 to 2010

R Codeslibrary(ggplot2)library(grDevices)IliganCity <- c(104493, 118778, 167358, 226568, 273004, 285061, 308046, 322821)CensalYear <- c("1970", "1975", "1980", "1990", "1995", "2000", "2007", "2010")qplot(CensalYear, IliganCity, xlab = expression...

Population of Tawi-Tawi from 1903 to 2010

May 16, 2012

By Al-Ahmadgaid Asaad

Population of Tawi-Tawi from 1903 to 2010

R Codeslibrary(ggplot2)library(colorRamps)TawiTawiPop <- c(17000, 45000, 46000, 59000, 79000, 110000, 143000, 195000, 228204, 250718, 322317, 450346, 366550)YearNames <- c("1903", "1918", "1939", "1948", "1960", "1970", "1975", "1...

Example: Two Sample t-Test

January 31, 2012

By Al-Ahmadgaid Asaad

The recovery time (in days) is measured for 10 patients taking a new drug and for 10 different patients taking a placebo. We wish to test the hypothesis that the mean recovery time for patients taking the drug is less than for those taking placebo. The...

Example: One Sample t-Test

January 31, 2012

By Al-Ahmadgaid Asaad

Using the stack loss dataset, test the hypothesis that the mean of the stackloss is equal to 20 versus a two-sided alternative. Solution:Codes:Output:Interpretation: With the p-value greater than the level of significance alpha at 0.05, then we la...