stem-and-leaf plot
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The following measurements represent the systolic and diastolic blood pressures (mm HG) for a group of individuals awaiting confirmation for enrollment in a study investigating the efficacy of a new anti-hypertensive medication.
|
SYSBP |
DIASBP |
|
118 |
73 |
|
132 |
81 |
|
147 |
87 |
|
145 |
91 |
|
129 |
73 |
|
126 |
81 |
|
132 |
83 |
|
156 |
97 |
|
164 |
102 |
|
162 |
101 |
|
167 |
103 |
|
121 |
78 |
A) Create a stem-and-leaf plot for both systolic and diastolic blood pressure.
B) Suppose that Hypertension is categorized by a Systolic blood pressure above 159 mm HG or a diastolic blood pressure above 99 mm HG. What is the relative frequency of the potential participants with hypertension?
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- An engineer measured the Brinell hardness of 25 pieces of ductile iron that were sub critically annealed. The resulting data were:170167174179179187179183179 156163156187156167156174170 183179174179170159187 Test hypothesis that the mean Brinell hardness of all such ductile iron pieces is greater than 170.In experiments to determine the effectiveness of drugs such as anti-fungal ointments that are applied to the skin, the concentration of the drug in a patient’s skin must be measured. The article “Determining Bioequivalence of Topical Dermatological Drug Products by Tape- Stripping” (W. Navidi, A. Hutchinson, et al., Journal of Pharmacokinetics and Pharmacodynamics, 2008:213–220) describes an improved method of measuring that is designed to ensure that all the drug in the skin is recovered. Assume that in an experiment using the old method, the mean amount of drug recovered from a sample of 49 patients was 105 ng with a standard deviation of 20 ng, and that in an experiment using the new method the mean amount of drug recovered in a sample of 35 patients was 117 ng with a standard deviation of 15 ng. Find a 98% confidence interval for the difference in the mean amounts recovered between the two methods.The following data are on the dental measurements (distance in mm from the center of the pituitary to the pterygomaxillary fissure of 11 girls and 16 boys, all of whom were 16 years of age. Girls Boys 23.0 31.0 25.5 26.5 26.0 27.5 26.5 27.0 23.5 26.0 22.5 28.5 25.0 26.5 24.0 25.5 21.5 26.0 19.5 31.5 28.0 25.0 28.0 29.5 26.0 30.0 25.0 Reference SAS image to answer following questions 1. A. What are the appropriate null and alternative hypotheses for this research question using the appropriate population parameter(s) for SAS output for a t-test? b. Based on the output, which p-value tests the following hypotheses if you want to use a two-sample independent pooled t-test? Provide the specific test statistic and p-value. 2. From the output, what is the estimate of the pooled standard deviation? 3. From the output, what is the standard error for the average difference in…
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