The accompanying data on response time appeared in the article "The Extinguishment of Fires Using Low-Flow Water Hose Streams-Part II" (Fire Technology, 1991: 291-320).

The authors analyzed the data with the pooled t test. Does the use of this test appear justified? [Check for normality. The z percentiles for n = 8 are -1.53, -.89, -.49, -.15, .15, .49, .89, and 1.53.]

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Good visibility 43 1.1737 47 68 58 50 2.75 Poor visibility 147 80 158 1.53 4.33 4.23 3.25 3.22