Research Methods (LLP207)
SPSS 3: T-tests and ANOVA
Note: Refer to lecture 6 for instructions to perform. the analyses in this practical session
1.) Download the file “P3_GDP_2001-2008.sav” from the LEARN and open it using SPSS software.
· The dataset contains data relating to the Gross Domestic Product (GDP), in billions of US Dollars ($), for 36 countries from three continents (Africa, Europe, South America), over the period 2001 to 2008. Data source: http://data.worldbank.org/indicator/NY.GDP.MKTP.CD
· There are no missing data or reverse coded data in this particular dataset.
· Refer to your lecture slides from Lecture 6 for detailed guidance on performing the SPSS analyses requested below.
2.) Calculate a paired-samples t-test between the GDP of all 36 countries from 2007 to 2008.
· Look at the result. Was there a significant difference in the GDP between the two years? If so, was GDP increasing or decreasing?
3.) Calculate an independent-samples t-test between the GDP of the 12 countries in Africa and the 12 countries in South America in 2008.
· Look at the results. Was there a significant difference in the 2008 GDP between the countries from the two continents? If so, which continent’s countries had the highest GDP?
4.) Calculate a repeated-measures one-way ANOVA between the GDP of all 36 countries from 2001 to 2008.
· Look at the results. Is there a significant difference between the GDP of the 36 countries between the years 2001 and 2008? Plot a line graph to examine the trend.
· Look at the post-hoc Bonferonni pairwise comparisons between the GDP of each year. Between 2001 and 2008, on how many occasions did GDP increase from one year to the next?
5.) Calculate an independent-samples one-way ANOVA between the GDP of the 12 countries in each of the three continents in 2008.
· Look at the results. Is there a significant difference between the GDP of the 12 countries in each of the three continents in 2008? Look at the post-hoc pairwise Bonferonni comparisons to interpret the result.