2. An automobile battery manufacturer claims that the batteries it produces have an average life of 40,000 miles. A random sample of 60 batteries was approved and had an average duration of 40,800 miles, with a sample standard deviation of 5,400 miles with a confidence level of 95.0%. The battery manufacturer's statement is valid. a) What would be the parameter for this test b) This test would be one or two tails. c) Make a statement of the null hypotheses and the alternative d) Follow the appropriate procedure to test the hypothesis raised in point c