Two Types of Flares Were Tested for Their Burning Times $\text { Brand } \mathrm { X }$

Essay

Two types of flares were tested for their burning times (in minutes).Sample results are given below. $\text { Brand } \mathrm { X }$ $\text { Brand } \mathrm { Y }$ n = 35 n = 40 $\overline{x}$ = 19.4 $\overline{x}$ = 15.1
s = 1.4 s = 0.8
Refer to the sample data to test the claim that the two populations have unequal means.Carry out the test with a 1% significance level.