versionBbiostatsextracredit

versionBbiostatsextracredit - Alan Berryman Extra Credit...

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Alan Berryman Extra Credit Exercise Exam 1 (Version B): True/False: 1.The probability distribution of a binomial variable is not asymptotic to the x-axis. -I put true because I knew that a the probability distribution of a binomial variable is not asymptotic to the axis -The correct answer was true. -The probability distribution of a binomial variable is not asymptotic to the axis because the probabilities can reach zero, and the binomial distribution does not get infinitely closer to the axis. 2. Obtaining a random unbiased sample is usually more readily achieved in physiological experiments, than in physiological social studies. -I put true because I knew that it was correct. -The correct answer was true. -It makes sense that a physiological experiment would make it easier to obtain a random unbiased sample than a physiological social study, since in social studies there are much more confounding factors such as experimenter bias, subject bias, and sampling errors like people unwilling to participate or similar things. 3.On the normal distribution Z 0.0019 = -2.90 -I put true because I read the question wrong. -The correct answer should be false. -
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4. It is reasonable to delete points from the data set, so long as you formally confirm them as outliers beforehand. 5. Conditional probability is the probability of a second event occurring if that event is dependent on another event. 6. The median is the location center of the data, where 50% of the case values are greater than this point and 50% are less than this point. On right skewed data the mean would lie to the right of the mode and the median would lie to the left of the mean. 7. If the prevalence of Pseudohermaphroditism is low, Pseudohermaphroditism rates should not be modeled by the binomial distribution. However, if np>5, it should be modeled by the Poisson distribution. 8. Areas under a relative frequency distribution sum to 1 and deviations from the mean sum to 1. 9. The IQR is a less sensitive measure of center than the SD. 10. The distribution of voting preferences conform to the binomial distribution; if you are interested in those who vote democrat relative to the rest of the voting preferences (i.e. democrat = success & other = failure) and the cases are randomly sampled from a large population. 11. The distribution of heights of a sample of 18 year old American adults who have been forced to eat British food (for 12 years) was plotted. For the histogram determine the closest correct statements regarding the sample. 12. The time spent preening by fraternity brothers on a Friday night ranges from 101 to 169 minutes. What is the closest five number summary for the data in the following stem & leaf diagram.
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This note was uploaded on 02/22/2012 for the course BIO 318m taught by Professor Staff during the Spring '08 term at University of Texas.

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versionBbiostatsextracredit - Alan Berryman Extra Credit...

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