Direction: Perform what is being asked. Follow the steps indicated to complete the activity and write your answer on the space provided. Maye was able to sell 5 different kind of smart phones in 1 month with the following number (x) 12, 13, 15, 18 and 20. Suppose that two kinds of smart phone were selected as samples, determine the mean and variance of the sampling distribution of sample mean. Follow the 7 steps. Steps: Solution: 1. Compute the mean of the population. 2. Compute the variance of the population3. Determine the number of possible samples of size n=2. 4. List all possible samples and their corresponding means 5. Construct the sampling distribution of the sample means. 6. Compute the mean of the sampling distribution of the sample means. Follow these steps: a. Multiply the sample mean by the corresponding probability. b. Add the results 7. Compute the variance of the sampling distribution of the sample means. Follow these steps: Follow these steps: a. Subtract the population mean from each sample mean. b. Square the difference. c. Multiply the results by the corresponding probability. d. Add the results. Situation 2: Determine whether the following situation has a known and unknown variance. Problem answer Samples of 3 items are drawn at random without replacement in a population composed of 7 items whose values are 1, 2, 3, 4, 5, 6, and 7. The general weighted average (GWA) of the NAT takers in a certain school has been consistently a = 93.45. This year a sample data of the taker's GWA are 89, 87, 89, 90, 88, 91, and 92. Given # = 15, s = 6 and n =16 Given # = 34, o' = 9.5 and n = 19