Ps15 Week 1 Assignment

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PS15 S13 COMPUTER LAB 7 In part I you will briefly explore how the origins of the p-values. In part II you will do analysis of dimensions within a measure using correlations and factor analysis. PART I – NULL DISTRIBUTION FOR THE DIFFERENCE OF MEAN VALUES As was discussed in the lecture last Tuesday, often we are interested in questions like: is one group’s average different than the other group’s average? For instance, you may have a hypothesis that living in a city makes a person more liberal. You would conduct a survey where you would ask the respondents to rank themselves on the liberal-conservative scale, and then you will compare the averages for the urban residents and the country-side residents in order to demonstrate the presence of the effect. However, due to sampling error, even when you know that the difference between group averages is zero, the outcome may be non-zero. Here is your opportunity to discover this for yourself. Step 1 – data file Open the Excel file newspaper.xlsx on Gauchospace. Click on the tabs in the lower left corner to explore Sheet 1 of the spreadsheet. Columns A and B contain identical data: responses to the question “How many days a week do you read a newspaper?” You have already worked with responses to this question: it is variable v020 in the NES2008 dataset and it has a very non-normal distribution…show more content…
At the same time, V156 (nuclear weapons) is very weakly correlated with V157 (defending human rights) and V162 (promote market economies abroad). In the same vein, V157 (defending human rights) is relatively strongly correlated with V159 (combat world hunger), V161 (bring democracy to world), and V162 (promote market economies abroad). Thus, we might be justified in thinking that there are at least two dimensions: one militant (self-defense) and the other

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