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Unformatted text preview: Page 1 of 4 BME 423 Fall 2011 HOMEWORK #1 Due before class Wednesday September 21, 2011 Please read the homework guidelines before starting your assignment. Tables necessary for completing this homework can be found in your textbook and are posted on Blackboard. 1. Descriptive Statistics (15 points) a. The heart rates measured in beats/min, of a random sample of BME 423 students are: 48, 64, 56, 68, 72, 78, 36, 92, 88, 78, 80, and 84 (n = 12) Calculate the following: Sample mean Sample median Sample variance Sample standard deviation Range 25 th , 50 th , and 75 th percentiles Standard error of the mean (SEM) b. The above sample was taken from a population of 71 students (the BME 423 class). Estimate the mean and standard deviation for the heights of the whole population. How would you characterize the error in your estimate of the true population mean? How does this error change with sample size (e.g., what if we had been given data for 40 students, or 4 students)?...
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