HW3 - BME 423 HOMEWORK SET#3 FALL 2007 1 Inspiratory muscle...

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BME 423 HOMEWORK SET #3 FALL 2007 1. Inspiratory muscle function is assessed in patients with severe kyphoscoliosis by measuring the maximum inspiratory pressure (Pimax) developed against an occluded airway. The values of Pimax (in cm H 2 0) are given below for 7 patients: Patient #: 1 2 3 4 5 6 7 Pimax: 49.7 63.3 47.2 37.3 19.3 29.8 23.2 Determine the 95% confidence intervals for the population mean value of Pimax in kyphoscoliosis. 2. Find the 95 percent confidence interval for the difference in the mean duration of labor in women treated with prostaglandin E 2 gel compared with women treated with placebo gel using the following data: prostaglandin group – n = 19, mean duration = 7.9h, std. dev. = 5.2hr; placebo group – n = 19, mean duration = 15.2h, std. dev. = 4.4hr. Based on this confidence interval, is the difference statistically significant with P < .05? 3. Data from 10 premature infants from a larger study are shown in the table below. For each infant their gestational age in weeks is given along with their head circumference in cm. a. Find the linear regression relationship between gestational age (independent variable) and
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