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.