259611 The a a normal distribution. 31 percentage of items are under 45 and & per can above 64, Find out Mean and Standard Deviation. 4, (8) Explain the relative merits and demerits of various sampling methods Or (b) Memory capacity of 9 students are tested before and after training. From Its following results, state whether the training is effective at 5% Level of Significance by using t-test. Students 2 3 Before 10 15 19 After 12 20 5." (a] Explain the steps in arriving F-ratio under one-way and two-way classification Or (b) Two sources of raw materials are under consideration by a company. Both sources appear to have same characteristics, but the company is not sure by their uniformity, A sample of 10 lots from Source-A yields a variance of 225 another sample of 1 1 lots from Source-B yields a variance of 200. Is it like that the variance of Source-A is significantly greater than Source-B at 1 per level of significance? 6. () How Non-parametric tests are different from parametric tests? Explain (b) A company's trainers are randomly assigned to groups which are taught industrial inspection procedure by three different methods. At the en instructing period, they are tested for inspection performance quali following are their scores: Method-A 83 83 79 85 90 68 Method-B 87 84 72 57 91 Method-C 03 65 77 Use the 'H' - Test to determine at the 0,05 Level of Significance, wheth methods are equally effective