Stats Grades Correlation and Regression Unit 4 studentswithsolutions/view-tutorial.aspx?TutorialId=39967 Using the Statistics Class dataset called “Stat_Grades.sav,” answer the following. 1. Which of the five Quizzes has the strongest relationship with overall student performance on the Final Exam? Include all SPSS outputs that you will use to answer this question. Explain your choice. Is this relationship strong enough to use these variables in a prediction equation? Why or why not? Which is the best Quiz to use to predict the Final Exam? 2. Create a scatterplot to show the relationship between your chosen highest correlation quiz from problem 1 above, and the final exam points. Use your quiz as the independent variable and the final exam points as the dependent variable. Fully label your scatter plot graph. Assess this scatter plot and determine if it shows a strong correlation between the quiz and the final exam? Why or why not? Explain and discuss. 3. Using the most appropriate quiz, create a regression prediction equation that can be used to predict a final exam score given a quiz score. Show all work and SPSS results that you used to create the prediction equation. Be sure to specify which quiz you chose and why. Explicitly note the dependent or criterion variable and the independent or prediction variable. Show the entire prediction equation. 4. Using your prediction equation, evaluate and predict what the final exam score would be for a student who has a quiz score of 6. Show all work and how you calculated your prediction. Do you agree with this prediction? Why or why not? Are predictions such as this one 100% accurate? Are these types of predictions good estimates? 5. Suppose you would like to predict a student’s final exam points using their short-form IQ score and their Previous GPA. Calculate the appropriate correlations (include SPSS correlation results here) and discuss whether you expect your independent variables of short-form IQ score and Previous GPA to offer a good prediction for final exam points. Include both appropriate scatterplots in your discussion as well. 6. Create a prediction equation to predict a student’s final exam points using their short-form IQ score and their Previous GPA. Show all work and steps, including any SPSS results that you use. Using your prediction equation, predict the final exam score for a student with an IQ of 120 and a GPA of 3.5. Show all work. Assess your results and discuss whether you agree with this prediction?
Posted on: Mon, 14 Jul 2014 04:04:14 +0000
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