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Unformatted text preview: STAT 200 Midterm Exam (Section 103, MWF 2pm) (Time: 50 minutes , Wednesday, October 27, 2010, 2:00 - 2:50pm, II ) Name: Student ID: This exam is to be done with closed notes/books. One “cheat sheet” ( 8 . 5 × 11 , two sided) is allowed. Make sure you write your name and student ID . Problem 1 (10 pts). Circle the correct answer: true (T) or false (F) (one answer only). (1) The sample mean always under-estimates the population mean because of sampling vari- ation. T F (2) There is only one way for a set of numbers to have standard deviation of zero and that is to have identical numbers. T F (3) A measure of spread (or spread-out) gives some idea about the size of the mean. T F (4) Although the probability of an event (on a single trial) occurring is 0.95, the event may not occur at all in 5 independent trials: T F (5) The mean of the sampling distribution of the sample mean is equal to the population mean. T F Problem 2 (40 pts). Circle the (one) answer that is the most appropriate. (1 ) The distribution of the values taken on by a statistic in a large number of samples from the same population is called (a) the parameter. (b) bias. (c) the sampling distribution. (d) a table of random digits. (2) What type of distribution is described by the following information: the mean is much larger than the median and the distribution is unimodal (assuming there is no outlier)?...
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This note was uploaded on 05/09/2011 for the course STAT 200 taught by Professor Karim during the Spring '08 term at UBC.
- Spring '08