Intro to Biomedical Statistics

% within Control group % within Experimental group % of total (60%) (100%) (40%) (40%) (44.44%) (26.67%) (100%) (66.67%) (66.67%) Yes % within Control group % within Experimental group % of total 0 (0%) (0%) (0%) 5 (100%) (55.56%) (33.33%) 5 (100%) (33.33%) (33.33%) Total % within Control group % within Experimental group % of total 6 (40%) (100%) (40%) 9 (60%) (100%) (60%) 15 (100%) (100%) (100%) 13. Below are the values for diastolic and systolic blood pressure for 10 people: Diastolic: 90 80 90 78 76 78 80 70 76 74 Systolic: 130 126 140 118 114 112 120 110 114 116 Using StatCrunch, construct a scatterplot that shows the relationship between the two variables. Copy and Paste your work from StatCrunch into your Word document submission. Verbally describe the direction and magnitude of the relationship. - As shown above, the direction and magnitude of the scatterplot is a moderate positive relationship – but as you can see, most of the results show a normal blood pressure. 14. Compute the correlation coefficient (Pearson’s r ) in StatCrunch to summarize the relationship for the data presented in Exercise 13. How accurate was your description? - Correlation between Diastolic and Systolic is: 0.90936143 - My description was pretty accurate – as it shows that the results had moderately increased. 15. Below are Global carbon dioxide concentrations and the measured change in Global temperature (Temperature Anomaly) for an 11 year period in our recent past: YEAR CO 2 Concentration (ppm) Temperature Anomaly (ºC) 1981 339.93 .043 1982 341.13 .022 1983 342.78 .097 1984 344.42 .074 1985 345.90 .091 1986 347.15 .066 1987 348.93 .267 1988 351.48 .155 1989 352.91 .267 1990 354.19 .509 1991 355.59 .430 Using StatCrunch, construct a scatterplot that shows the relationship between the two variables (carbon dioxide concentrations and the measured change in Global temperature). Calculate the r value using StatCrunch. Copy and Paste your work from StatCrunch into your Word document submission. Verbally describe the direction and magnitude of the relationship you find. What does this tell you about Global warming? - As shown above, this is also a moderate positive value – it tells me that global warming has been increased slowly but is moderately effecting through the 11 year period.

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