PSY:5110 Applied Statistics Week 3 – Assignment: Calculate And Interpret Data

Instructions

This assignment has two parts, which will be submitted in one document.

For this task, you will calculate the mean, median, and mode for a fictitious data set. These data represent the results of a fictitious study, which investigates whether a new drug (Drug A) is more effective than a placebo (i.e., an inactive substance) in the treatment of depression. The researcher is also interested in whether the effects of the drug varies by age so participants between the ages of 18-39 years were recruited (the younger adult group), and participants between the ages of 60-80 years were recruited (the older adult group). Participants were randomly assigned to either the placebo group or to the drug group (Drug A). All participants were first screened to ensure they met the criteria for depression. After 2 months of taking either the placebo or Drug A, participants returned to the lab and completed a measure of depressive symptomology called the Beck Depression Inventory-II (BDI-II).

Part 1:

For the first part of this assignment, create a table showing the mean, median, and mode for each participant group and each drug condition on the score for the BDI-II. The data for each participant are contained in the “Participant Data” worksheet in the Data1 File. You may use Excel or you can calculate these values by hand. Your table should look like the following:

Younger Adults
PlaceboYounger Adults
Drug AOlder Adults
PlaceboOlder Adults
Drug AMean    Median    Mode

You must have the “Data Analysis” add-in installed. Directions for this installation are provided in the “Data Analysis in Excel 2016” file located under your weekly resources. These instructions will also work for Excel 2010. This document also describes how to calculate basic descriptive statistics using Excel.

Part 2:

For this part of the assignment, create a bar chart in Excel. You will need the “Summary Data for Graph” worksheet from the Data 1 file. Remember, the bar chart shows the means for each condition rather than individual participant data, and the data in this worksheet have been organized accordingly.

For the steps regarding how to create the bar graph, review the steps in “Creating a Bar Graph in Excel 2016” or “Creating a Bar Graph in Excel 2010,” located under your weekly resources. These instructions should also work with other versions of Excel.

You should copy and paste the graph you create into a Word document, along with your table showing the mean, median, and mode.

Length:1-2 pages

Your graph and table should demonstrate thoughtful consideration of the ideas and concepts presented in the course by providing new thoughts and insights relating directly to this topic. Your response should reflect scholarly writing and current APA standards.

Creating a Bar Graph in Excel 2016

The means for each group are included in a bar graph and not individual participant data. Be sure to use the data in the “Summary Data for Graph” worksheet contained in the Data 1 workbook. The means have already been calculated and organized appropriately for each condition.

To create a bar graph in Excel 2016, complete the following steps:

1. Select all the data (Columns A, B, and C; Rows 1, 2, and 3):

2. Click “Insert” and then click on the arrow next to the “Insert Column or Bar Chart” option:

3. Select “2-D Column.” When you click on “2-D Column, ” a bar chart will be created for you. Be sure to format the chart appropriately. The chart should be selected; if it is not selected, click on the chart and you will be presented with formatting options in the “Design” tab. On the far left is an option called “Chart Layouts” and within that is the “Quick Layout” option. Click on the arrow to view the variety of options available to you.

4. Select “Layout 5” because it gives you the option to label the x-axis and y-axis and allows labels for the levels of the independent variable. The independent variable is called “Drug Condition” and the two levels are “Placebo” and “Drug A.”

The text “Axis Title” constitutes text boxes and you can click on to change the label for the x-axis and y-axis; remember, the BDI score is on the y-axis and the name of the independent variable is along the x-axis.

You have the option to remove the horizontal lines that appear across the graph. You can remove those lines by clicking on one of the lines, which should select all lines. Then, you can press the delete key on your computer to remove lines.

You can also change the font type and size of the font by selecting the entire graph and then selecting the appropriate font style and size.

Creating a Bar Graph in Excel 2010

The means for each group are included in a bar graph and not individual participant data. You should use the data in the “Summary Data for Graph” worksheet contained in the Data 1 workbook. The means have already been calculated and organized appropriately for each condition.

To create a bar graph in Excel 2010, complete the following steps

1. Select all the data (Columns A, B, and C; Rows 1, 2, and 3):

2. Click “Insert,” and then click on the arrow next to the “Column” option:

3. Select “2-D Column.” When you click on “2-D Column,” your bar chart will be created for you. Now, format the chart appropriately. The chart should be selected; if not, click on the chart and you will be presented with formatting options in the “Design” tab. Click on the arrow next to “Chart Layouts,” and then you will be presented with a variety of options.

4. Select “Layout 9” because it gives you the option to label the x-axis and y-axis and allows labels for the levels of the independent variable. The independent variable is called “Drug Condition” and the two levels are “Placebo” and “Drug A.

· The text “Axis Title” constitutes text boxes. You can click on that text to change the label for the x-axis and y-axis; remember, the BDI score is on the y-axis and the name of the independent variable is along the x-axis.

· If you would like, you can also remove the horizontal lines, which are located across the graph. You can do this by clicking on one of the lines. This step should select all lines, and then you can press the delete key on your computer.

· You can also change the font type and size of the font by selecting the entire graph and then selecting the appropriate font style and size.

 
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