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).

Good visibility

.43 1.17 .37 .47 .68 .58 .50 2.75 Poor visibility 1.47 .80 1.58 1.53 4.33 4.23 3.25 3.22 The authors analyzed the data with the pooled t test. Does the use of this test appear justified? [Hint: Check for normality.

The z percentiles for are

, and 1.53.]