# PSY 2007 Assignment 3 Independent and Dependent Variables

## PSY 2007 Assignment 3 Independent and Dependent Variables

PSY 2007 Assignment 3 Independent and Dependent Variables

Identified the independent and dependent variables in this study. For the independent variables, explained the possible levels of the variables or the range of values.

Explained the relationship between the sample and the population in the study.

Identified the scales of measurement for each of the variables. Explained why the scale of measurement is appropriate for this study.

Provided the calculation for (ΣX)/n for the students’ evaluations (on a scale of 1 to 10).

Provided the calculation of (Σ(X + 5))/n for the students’ evaluations (on a scale of 5 to 15).  (3 points)

Described the formula for the calculation if each student gives the professor one point higher.

Wrote in a clear, concise, and organized manner; demonstrated ethical scholarship in the accurate representation and attribution of sources (i.e., APA format); and displayed accurate spelling, grammar, and punctuation.

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Performed the following:

Collected the required data from a variety of individuals.

For each of the variables, manually calculated the mean, the median, the mode, the standard deviation, and the variance.

Interpreted the data for any interesting trends. Identified many trends and included your own novel interpretations of why they occurred.

Wrote in a clear, concise, and organized manner; demonstrated ethical scholarship in the accurate representation and attribution of sources (i.e., APA format); and displayed accurate spelling, grammar, and punctuation.

Performed the following calculations:

Determined what scores correspond to the top and bottom 10% and 25% of the data.
Transformed the z-score formula for solving for the individual score.
Determined the z-score that corresponds to the top 10% and substituted in your values for the mean and the standard deviation. Repeated the steps for the bottom 10% and the top and bottom 25%.
Determined what percentage will be between 3 and 7 for both variables.
Computed the z-score for each value. Explained the process for converting a z-score to a percentile.