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Question description

Fire is a serious threat to shrubs in dry climates.

Some shrubs can resprout from their

roots after their tops are destroyed. One study of resprouting took place in a dr

y area of

Mexico. The investigators randomly assigned shrubs to treatment and control groups, each

consisting of 12 shrubs, clipped the tops of all shrubs, then applied a propane torch to the

treatment group. A shrub is a success if it resprouts. In the

control group where no shrubs

were torched, 12 shrubs resprouted. In the treatment group where all shrubs were torched, 8

shrubs resprouted. How much does burning reduce the proportion of shrubs in this species

that resprout? Give a 90% confidence inte


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