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WebAssign for Rosner's Fundamentals of Biostatistics, 8th Edition [Instant Access], Single-Term
8th Edition
ISBN: 9780357452905
Author: Rosner
Publisher: Cengage Learning US
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Chapter 2, Problem 25P
Forced expiratory volume (FEV) is an index of pulmonary
Compare the pattern of growth of FEV by age for boys and girls. Are there any similarities? Any differences? Hint: Compute the mean FEV by age group (3-4/5-9/10- 14/ 15-19) separately for boys and girls and plot the meanFEV by age.
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Ankle Brachial Index. The ankle brachial index (ABI) compares the blood pressure of a patient’s arm to the blood pressure of the patient’s leg. The ABI can be an indicator of different diseases, including arterial diseases. A healthy (or normal) ABI is 0.9 or greater. In a study by M. McDermott et al. titled “Sex Differences in Peripheral Arterial Disease: Leg Symptoms and Physical Functioning” (Journal of the American Geriatrics Society, Vol. 51, No. 2, pp. 222–228), the researchers obtained the ABI of 187 women with peripheral arterial disease. The results were a mean ABI of 0.64 with a standard deviation of 0.15. At the 1% significance level, do the data provide sufficient evidence to conclude that, on average, women with peripheral arterial disease have an unhealthy ABI?
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Climate change 2013 Data collected from around the globe show that the earth is getting
warmer. The most common theory relates climate change to an increase in atmospheric levels of carbon
dioxide (CO2), a greenhouse gas. The mean annual CO2 concentration in the atmosphere (parts per
million) is measured at the top of Mauna Loa in Hawaii (away from any local contaminants) and
available at ftp://aftp.cmdl.noaa.gov/products/trends/co2/co2_annmean_mlo.txt
The mean surface air temperature is recorded as the change in °C relative to a base period of 1951 to
1980. It is available at data.giss.nasa.gov/gistemp/graphs_v3/
Here are a scatterplot and regression for the years from 1970 to 2013:
14.6 +
14.4 +
14.2 +
14.0
340
360
380
CO2
Response variable is
R-squared = 73.6% R-squared (adjusted) = 72.9%
s = 0.1316 with 44 – 2 = 42 degrees of freedom
Global Avg Temp
Variable
Coefficient
SE(Coeff)
t-Ratio
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10.6442
0.3418
31.1
S0.0001
0.010325
0.0010
10.8
S0.0001
a) Write the…
Chapter 2 Solutions
WebAssign for Rosner's Fundamentals of Biostatistics, 8th Edition [Instant Access], Single-Term
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