Example 2 A manufacturer has developed a new fishing line, which he claims a mean breaking strength of 15 kilograms with a standard deviation of 0.50 kilograms. To test the hypothesis that u = 15 kilograms against the alternative that u < 15 kilograms, a random sample of 50 lines will be tested. The critical region is defined to be a x<14.9. Assume o = 15 is correct. %3D a) Find the probability of committing a type I error when H, is true. b) Evaluate B for the alternatives µ = 14.8 and µ = 14.9 kilograms

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Q: Thanks a lot for your quick respons.   Best

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