lie ia l 17-13. A random sample of boots worn by 36 soldiers in a desert region showed an average lke of 1-08 years with a standard deviation of 0-6 years. Under the standard conditions, the boots are Inown to have an average life of 1:28 years. Is there a reason to assert, at 1% level of significance, that use in desert causes the mean life of such boots to decrease ? What will be your conclusion if the level of significance is 5% ? Assume that the life of boots is normally distributed.

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