Question

An engineering company, Faison Industries claims that the mean time it takes an employee to evacuate a building during a fire drill is less than 60 seconds. The union believes this is untrue and contracts a company to test the claim. A random sample of 50 employees and their evacuation times (in seconds) is listed in the stem-and-leaf plot below. At level of significance at 0.01, can you reject the company’s claim.

0	7,9
1	1,9,9
2	2,6,7,9,9
3	1,1,6,7,7,9,9
4	1,1,3,3,3,4,6,6,7
5	2,3,4,5,7,8,8,8,9,9
6	1,3,3,4,6,6,7
7	4,6,9
8	4,6
9	4
10	2

-Is there enough evidence to reject the engineering firm’s claim? Interpret your result.

Answer 1