Question
Test 2: For the following situations, identify the appreciate Null and Alternative Hypothesis. 1. The Standard Tire Company has introduced a new tire in Europe
Test 2: For the following situations, identify the appreciate Null and Alternative Hypothesis.
1. The Standard Tire Company has introduced a new tire in Europe that will be guaranteed to last at least 30,000km. Standard Tire has hired an independent agency to determine if there is overwhelming evidence that tires will last through the warranty period.
2. Mrs. Russel, Head Product Tester for Hathaway Tool Corporation, is testing a newly designed series of bar hooks. The hooks have been designed to give way if they get too hot. The previous design gave way at 240 degrees. Develop a test to determine if they newly designed hooks give way at a higher temperature than the previous design.
3. The regional manager of a large grocery chain believes that a checkout person using a new scanner can process a full basket of groceries in less than seven minutes. Develop a test to determine if there is overwhelming evidence to support the manager's belief.
4. A random sample of 100 customers in a bank is selected and their times to be served are noted. The bank has recently retained its tellers to be more efficient with the hope of decreasing its average time in servicing its customers, which has been 4 minutes in the past.
5. Independent random samples of 50 male and 50 female nurses are selected from the hospitals in a Southern state. Each nurse is asked whether he or she is satisfied with the working conditions in the hospital. It is of interest to see if there is a difference between male nurses and female nurses on satisfaction with working conditions.
6. A group of 45 high school seniors take the SAT achievement test both before and after a 3 month training course, which is designed to improve SAT scores. We wish to determine if the training course is effective.
7. A local driver training school claims that at least 75% of its pupils pass the driving test on their first attempt. A sample of 60 students from the school is selected, and their performances on the driving test are noted. Based upon the data collected, we would like to refute the claim of the school.
8. Starting salaries are determined for 40 female and 40 male electrical engineers. It is of interest to determine if female electrical engineers tend to have higher starting salaries than their male counterparts. Does the evidence support the idea that female engineers start at higher salaries than the male engineers?
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