Coming back to this example we had dicussed in class:

(a) What are the variance and standard deviation of the population mean Yi? (b) What is the standard error of the means of Samples 1 and Sample 2? (c) Suppose now we want to examine if the sample means of Sample 1 and Sample 2 are significant different from each other, what kind of test we shall use?

2. Coming back to this example we had dicussed in class: Suppose the population for variable Y, consists of unit 1 2 3 4 5 6 7 8 9 10 Yi 4 2 5 5 3 1 2 5 4 5 Population mean: 3.6 Samples: Sample 1 Sample 2 unit 1 2 4 8 5 4 2 5 5 unit 2 9 Yi 2 3 4 Sample avg: 4 Sample avg: 3 (a) What are the variance and standard deviation of the population mean Y.? (b) What is the standard error of the means of Samples 1 and Sample 2? (c) Suppose now we want to examine if the sample means of Sample 1 and Sample 2 are significant different from each other, what kind of test we shall use? (d) What is the exact statisics number and what does it tell us about the difference