20 Question 7 continued _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Richard decides to conduct a test to investigate whether the mean delay on ‘morning rush’ trains from Brighton is more than 3 minutes greater than the mean delay on ‘morning rush’ trains from Southend-on-Sea. He calculates the following test value: [ . ( . )] [ ] . . . 3 39 0 709 3 2 45 55 3 10 56 2 074 2 2 −− − + = (c) Write down • the hypotheses of Richard’s test • the critical region of Richard’s test • whether Richard’s test value of 2.074 provides significant evidence against H0. (3) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________