MAT 3777 Study Guide - Final Guide: Bias Of An Estimator, Standard Deviation, Accounts Receivable
21 Nov 2018
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Due date: monday oct 29, 2018 in class. Total=50 marks: a university wants to estimate the proportion of its students who smoke regularly. Based on this preliminary result, re-compute the minimal sample size for part (a): suppose the university chooses the sample size estimated from (b), and nds that the sample proportion is p = 0. 15. Construct a 90% con dence interval for the population proportion p: a rm has a large number of accounts; 38% of its accounts receivable are wholesale and 62% are retail. However, it is di cult to identify an account without pulling a le and looking at it. An auditor took a srswor of 120 accounts and checked the balance (y in thousand dollars) of the selected accounts. Let yh and sh denote the sample mean and sample standard deviation for account category h, respectively. A summary of this sample is given as follows. Why: find an unbiased estimate of the population mean yu .
