Quantitative Design and Analysis

Part A– THE BASICS OF DATA COLLECTION & ANALYSIS Scales of Measurement –

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Requirements: Use yellowdig, 7864 COURSE STUDY GUIDE.

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Discussion Question – 2 Pages , 7th Edition APA, 2 References

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Having some anxiety about this class is common. Some people like numbers, and others are somewhat intimidated by them. But understanding statistics is about more than numbers. Statistics allows you to test hypotheses and gain important information about the world.

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Please post something to the discussion board related to the content covered this week. Do not create your post as a reply to the pinned post. Instead, use Yellowdig’s Create option to create a new post. Label your post with the hashtag for the week (#Week1).

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Here are some ideas for your post to get you started:

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• What is your experience with statistics and how is your anxiety level heading into this class? Give your post a hashtag in the body (e.g., #statsstress).
• Which outside resource (image, video, article, self-recording) speaks to what you’re feeling about statistics and this course? Share the link within your post. Why did you pick that item to share?

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Part B – Exploring SPSS and Descriptive Statistics.

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Assignment Instructions

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DESCRIPTIVE STATISTICS

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Your first IBM SPSS assignment includes two sections in which you will do the following:

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• Create two histograms.
• Calculate measures of central tendency and dispersion.

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This will give you some experience with the data set.

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Key Details and Instructions

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The grades.sav file is a sample SPSS data set. The data represent a teacher’s recording of student demographics and performance on quizzes and a final exam. This week, you will create and describe two histograms and a descriptives table using these data.

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Part 1

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Create two histograms for visual interpretation using the following variables:

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 SPSS Variable Definition Gender female =1; male =2 Final final exam: number of correct answers

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Create two histograms and paste them into your Word document:

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• A histogram for male students.
• A histogram for female students.

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Briefly describe what a visual inspection of this output tells you about the nature of the curves.

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Part 2

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Create a descriptives table to assess measures of central tendency and dispersion using the following variables:

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 SPSS Variable Definition GPA Previous grade point average Quiz3 Quiz 3: number of correct answers

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Create a descriptives table and paste it into your Word document.

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Under the table:

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• Report the mean, standard deviation, skewness, and kurtosis for GPA and quiz3.
• Briefly describe what skewness and kurtosis tell you about these data with regard to normality.

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Submit both sections of your assignment as an attached Word document.

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Competencies Measured

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By successfully completing this assignment, you will demonstrate your proficiency in the following course competencies and assignment criteria:

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• Competency 1: Analyze the computation, application, strengths, and limitations of various statistical tests.

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• Below the output, provide an accurate interpretation of histograms for males and females.
• Below the output, report descriptive statistics and interpret skew and kurtosis values.
• Competency 5: Apply a statistical program’s procedure to data.

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• Provide histograms for males and females.
• Provide a descriptive statistics table.

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Discussion Question – 2 Pages , 7th Edition APA, 2 References

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We use statistics all the time to drive decisions, evaluate outcomes, and determine where to invest.

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Please post something to the discussion board related to the content covered this week. Do not create your post as a reply to the pinned post. Instead, use Yellowdig’s Create option to create a new post. Label your post with the hashtag for the week (#Week2) so that others can sort posts by the week’s topic.

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Here are some ideas for your post to get you started:

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How have you seen or used statistics yourself in your workplace? Give your post a hashtag in the body (e.g., #reallifestats).

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Which outside resource (image, video, article, self-recording) best reflects what your own experience with statistics has been? Share the link within your post. Why did you pick that item to share?

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Part C – Correlation Introduction

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Discussion Question

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This week is about spurious correlations. Check out these real-life examples: Spurious Correlations.

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Please post something to the discussion board related to the content covered this week. Do not create your post as a reply to the pinned post. Instead, use Yellowdig’s Create option to create a new post. Label your post with the hashtag for the week (#Week3) so that others can sort posts by the week’s topic.

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Here are some ideas for your post to get you started:

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• After looking at examples of Spurious Correlations, answer the question, Why do you need to be cautious when interpreting correlations? Give your post a hashtag (e.g., #Pinocchiostats).
• Which outside resource (image, video, article) gives a great example of spurious correlations “in the wild”? Share the link within your post. What struck you most about this example?

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Part D -CORRELATION APPLICATION AND INTERPRETATION

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Instructions

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Complete the following for this assignment:

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Discussion Question

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Though numbers are thought to be less subjective than words and feelings, they still can be skewed when interpreted.

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Please post something to the discussion board related to the content covered this week. Do not create your post as a reply to the pinned post. Instead, use Yellowdig’s Create option to create a new post. Label your post with the hashtag for the week (#Week4) so that others can sort posts by the week’s topic.

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Here are some ideas for your post to get you started:

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• What role does researcher bias play in the interpretation of analyses? Why is this an ethical concern for researchers and is there any way around it? Give your post a hashtag (e.g., #statsskew).

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• For information on the data set, you may find the Data Set Instructions [DOC] helpful.
• Refer to the 7864 Course Study Guide for information on analyses and interpretation.

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The grades.sav file is a sample SPSS data set. The data represent a teacher’s recording of student demographics and performance on quizzes and a final exam across three sections of the course. Each section consists of 35 students (N = 105). There are 21 variables in grades.sav.

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This week’s assignment is on correlations. You will analyze the following variables in the grades.sav data set:

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 SPSS Variable Definition Quiz1 Quiz 1: number of correct answers GPA Previous grade point average Total Total number of points earned in class Final Final exam: number of correct answers

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Step 1: Write Section 1 of the DAA: The Data Analysis Plan

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• Name the four variables used in this analysis and whether they are categorical or continuous.
• State a research question, null hypothesis, and alternate hypothesis for total and final.
• State a research question, null hypothesis, and alternate hypothesis for gpa and quiz1.

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Step 2: Write Section 2 of the DAA: Testing Assumptions

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Test for one of the assumptions of correlation – normality.

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• Create a descriptive statistics table in SPSS to assess normality. This table should include the four variables named above.
• Paste the table in the DAA.
• Interpret the skewness and kurtosis values and how you determined whether the assumption of normality was met or violated.

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Step 3: Write Section 3 of the DAA: Results and Interpretation

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• Paste the intercorrelation matrix (SPSS Correlation table) for the four variables into the document.
• Below the output, first report the total-final correlation including degrees of freedom, correlation coefficient, and p value. Specify whether or not to reject the null hypothesis for this correlation.
• Second, report the gpa-quiz1 correlation including degrees of freedom, correlation coefficient, and p value. Specify whether or not to reject the null hypothesis for this correlation.

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Step 4: Write Section 4 of the DAA: Statistical Conclusions

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• Provide a brief summary of your analysis and the conclusions drawn about correlations.
• Analyze the limitations of the statistical test and/or possible alternative explanations for your results.

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Step 5: Write Section 5 of the DAA: Application

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Analyze how you might use correlations in your field of study.

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• Name two variables that would work for such an analysis and why studying the relationship may be important to the field or practice.

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Submit your DAA template as an attached Word document in the assignment area.

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Part E –t-Test Introduction

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This week is all about proverbial apples and oranges.

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Please post something to the discussion board related to the content covered this week. Do not create your post as a reply to the pinned post. Instead, use Yellowdig’s Create option to create a new post. Label your post with the hashtag for the week (#Week5) so that others can sort posts by the week’s topic.

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Here are some ideas for your post to get you started:

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• Why can’t you compare apples to oranges? Why would it be important to match your intervention and control groups on certain characteristics in a research study to help with interpretation of the results? Give your post a hashtag in the body (e.g., #applestoranges).
• Which outside resource (image, video, article) shows the danger of mismatched research methodology and data interpretation? Share the link within your post. What effect might this dissonance have on the impact of the research and its subject?