Homework Problem Number One

Twenty six rubber seals designed to prevent dirt from collecting on the wearing surfaces of ball joints was subjected to accelerated life tests. The resullts from the seven cars are as follows:

Car Number	Odometer at Failure (km)	Total Odometer (km)
01	2,467; 3,128; 3,283; 7,988	8,012
02	None	6,147
03	1,870; 6,121; 6,175	9,002
04	3,721; 4,395; 5,848; 6,425; 6,535	11,000
05	498	4,651
06	184; 216; 561; 2,804	5,012
07	2,342; 4,213	12,718

Is the underlying distribution exponential?

If It is exponential, then calculate the mean time to failure and 90% confidence band.

What is the expected reliability at 1000 km?

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