The following are the hours of operation to failure of 38 light bulbs.

Use a suitable statistical computer program to test whether the mean failure time of such light bulbs is significantly less than 300 hours. Use the 0.01 level of significance.

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Condition 155.6 56.1 618 55.9 514 599 543 62.8 58.5 55.8 58.3 60.2 54.2 50.1 57.1 575 63.6 593 60.9 618 Condition 2:55.1 435 51.2 46.2 56.7 525 535 605 521 47.0 53.0 53.8 516 53.6 42.9 52.0 55.1 57.1 62.8 54.8