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# day13 - Simple Random Sampling Ex A student government...

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Simple Random Sampling Ex : A student government organization is interested in estimating the pro- portion of students who favor a mandatory “pass-fail” grading policy for elective courses. A list of names and addresses of the 645 students enrolled during the current quarter is available from the registrars office. Suppose we want to select a simple random sample of 10 students. A simple random sample of size n from a finite population of size N is a sample selected such that each possible sample of size n has the same probability of being selected. 1. Assign each member of the population a number. 2. Use a random number table (Table 7.1 on page 261) to select n random numbers. Ex : Below are the first several rows of Table 7.1. 63271 59986 71744 51102 15141 80714 58683 93108 13544 79945 88547 09896 95436 79115 08303 01041 20030 63754 08459 28364 55957 57243 83865 09911 19761 66535 40102 26646 60147 15702 Our random sample of 10 students contains: 1

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We can also take simple random samples from infinite populations. Each element selected comes from the population. Each element is selected independently. Point Estimation Recall our goal in statistics: In general the population parameters ( μ , σ , and p ) are not known. We want to estimate them using statistics . We have the following estimates of the parameters. We estimate the population mean μ with the sample mean ¯ x .
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day13 - Simple Random Sampling Ex A student government...

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