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Unformatted text preview: satistic? Give an example? Q. 9: Central Tendency in sample; the sample mean. Q. 10 What is a random sample and its sample size? Q. 11 What is a sample variance? Give an example? Q. 12 A comparison of coﬀee prices at 4 randomly selected in HCM City showed increases from the previous month of 12, 15, 17 and 20 thousands VND for a kilogram bag. Find the variance of this random sampleof price increases. Q. 13 All examples in this Chapter and Exercises: 1-9 p. 200; 9-15 p.216; Q. 14 What is t-distribution? Q. 15 using table A.4 study examples 8.11-8.14. Q. 16 What is t-distribution used for ? Chapter 9: One and two-sample estimation problems Q. 17 What is estimation of population parameters? Give anexample? Q. 18 Deﬁnition of an unbiased estimator? Q. 19 What is the interval estimation? Conﬁdence interval of μ ; σ known 1 (unknown)? Study Examples 9.2; 9.3; 9.4. Q. 20 Solve exercises 1-20, p. 245-246. 2...
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