4. Some failure test data was collected, and the results were as follows: 0-1000 hours: 12 failures 1001-2000 hours: 8 failures 2001-3000 hours: 7 failures 3001-4000 hours: 13 failures 4001-5000 hours:

11 failures We wish to test this data to see if it follows a constant failure rate of 10 failures per 1000 hours. Use the Chi-squared goodness of fit test to determine if this data can represent a constant failure rate of 10 failures every 1000 hours. Hint: there are 5 'bins", so use DOF (v) of 5-1 = 4. The Chi-squared table is on pages 453 and 454 of your textbook.