White 52 46 34 54 46 52 39 39 37 46 36 59 43 40 44 45 65 33 42 36 57 46 50 55 60 35 67 32 54 52 57 47 47 61 38 Black 57 54 42 48 46 39 59 37 55 42 49 55 48 42 57 54 29 58 58 44 51 41 49 51 32 41 44 42 62 53 36 51 65 46 49 Hispanic 56 48 46 43 65 56 48 52 65 77 61 59 41 61 48 55 71 69 69 68 40 54 62 43 59 49 59 61 62 60 60 47 49 65 49 Other 51 55 54 50 38 47 31 67 45 53 38 45 59 56 50 53 57 32 51 45 67 43 46 52 48 53 28 64 48 65 49 54 63 59 48 Before 63 51 45 49 50 55 55 62 74 55 46 61 56 38 53 64 54 56 58 54 49 53 53 54 70 49 50 45 47 57 51 58 40 57 63 60 49 51 62 59 58 57 49 53 68 53 43 After 43 55 39 59 42 33 46 54 62 45 47 61 40 43 51 54 37 63 61 54 54 50 45 44 42 66 56 53 39 41 46 61 36 42 46 61 56 52 73 53 54 46 42 55 47 64 41 55 57 65 42 43 46 47 58 53 60 59 57 46 57 49 58 57 55 50 50 66 52 59 57 42 55 48 47 63 59 56 42 56 46 64 57 60 50 54 56 45 57 47 49 61 42 55 49 59 56 63 56 47 36 46 58 49 54 56 65 54 61 55 57 64 56 61 38 44 57 47 59 56 55 49 49 55 51 58 60 38 58 50 23 54 58 55 52 64 59 49 47 52 49 34 49 57 71 57 57 41 62 52 35 43 55 No Symptoms Symptoms 24 20 26 18 20 10 25 15 23 28 18 33 24 17 13 13 24 26 26 32 25 20 22 25 19 16 18 25 24 15 20 27 18 23 27 21 22 31 25 15 30 23 11 20 8 29 22 25 32 17 23 32 28 29 26 21 30 26 20 26 34 29 28 17 15 25 27 17 24 13 15 24 24 13 14 21 32 10 18 23 29 21 18 30 33 10 23 22 22 21 30 29 27 18 11 26 15 11 16 15 30 18 21 16 31 13 22 26 26 35 31 24 28 30 25 11 28 13 32 27 17 28 25 29 25 38 20 19 37 19 24 24 19 14 25 15 26 20 27 24 29 29 25 27 26 33 21 25 35 36 33 25 16 23 31 17 29 27 30 20 Chapter 11 Activity Things are really bad, now. No one has been able to figure out how to stop the virus from spreading or who might be more affected. You decide to take matters into your own hands and collect some sample data. Mission: You have organized your data from three different samples into an Excel spreadsheet. Now, you have to decide what type of test will be most appropriate for each sample. (Unless otherwise stated, use an alpha of 0.05.) On Sheet 1, you have data representing the virus score divided into ethnicity. Your question: Is there a difference in mean virus score between the four groups? 1. What type of test will be most appropriate to answer your question? 2. Check the assumptions associated with the test. Which of the assumptions are met? (Remember, you can use histograms or skewness/kurtosis to check for normality.) 3. Report the appropriate test statistic and p-value. (Round test statistic to two decimal places and p-value to three significant digits.) Test Statistic: P-value: 4. Conduct a test to determine which group(s) is different? 5. Report your results in APA format. On Sheet 2, you have data from an experiment. You have recorded data of virus score before and after a proposed treatment. Your question: Is the mean virus score lower after treatment? 6. What type of test will be most appropriate to answer your question? 7. Report the appropriate skewness and kurtosis for checking the normality of the data. (Round your values to three decimal places.) Skewness: Kurtosis : 8. Report the appropriate test statistic and p-value. (Round test statistic to two decimal places and p-value to three significant digits.) Test Statistic: P-value: 9. Report your results in APA format. Sheet 3 presents data displaying the virus score for two groups: those without symptoms and those with symptoms. Your question: Is there a difference in the mean virus score between the two groups? 10. What type of test will be most appropriate to answer your question? 11. What are the independent and dependent variables? Independent Variable: Dependen t Variable: 12. If applicable, report the p-value and conclusion for a test of the equality of variances. (Round p-value to three significant digits.) P-value: Conclusion : 13. Check the assumptions associated with the test. Which of the assumptions are met? 14. Report the appropriate test statistic and p-value for answering your question. (Round test statistic to two decimal places and p-value to three significant digits.) Test Statistic: 15. Report your results in APA format. P-value