Records were kept on the time of successive failures of the air conditioning system of a Boeing 720 jet airplane. If the air conditioning system has a constant failure rate, then the intervals between successive failure must have an exponential distribution. The observed intervals, in hours, between successive failures are as follows (F. Proschan, Technometrics, 1963):
Do these data seem to follow an exponential distribution at the 5% significance level? If possible, construct a normal scores plot for these data. Does the plot follow a straight line?