ANSWER 1-3

1. The General Electric Company clams that the life of LED light bulbs are has a mean life of 500 hours with the standard deviation of 50 hours. Test the claim of the manufacturer if a random sample of 80 LED light tested and found out to be 450 hours only. Use 5% level of significance. 2. The HRD officer claims that the overall score of the applicants in the trade test of ABC Company is less than the score of applicants hired last year. In a sample of 30 applicants, the mean score is 100 with a standard deviation of 13. Test the claim of the HRD at 0.05 level of significance. The mean score of the applicants last year was 109. 3. The nutritionist wants to know the difference in saturated fat contained in Big Mac as compared to Jolly Burger. Instead of relying on the published data of the two companies, the nutritionist buys 25 Big Mac and 29 Jolly Burger. She found out that the Big Mac have an average saturated fat content of 12.2 grams per burger with standard deviation of 2.6 grams. The Jolly Burger has an average of 11.3 grams per burger with a standard deviation of 3.1 grams. Decide how you responds to the claim at 5% significance that the average saturated fat of the tow burgers are different.Construct the Null and Alternative Hypothesis of the following in both statement and symbol form