Tumbleweed, commonly found in the western United States, is the dried structure of certain plants that areblown by the wind. Kochia, a type of plant that turns into tumbleweed at the end of the summer, is a problem forfarmers because it takes nutrients away from soil that would otherwise go to more beneficial plants. Scientistsare concerned that kochia plants are becoming resistant to the most commonly used herbicide, glyphosate. In2014, 19.7 percent of 61 randomly selected kochia plants were resistant to glyphosate. In 2017, 38.5 percent of52 randomly selected kochia plants were resistant to glyphosate. Do the data provide convincing statistical evidence, at the level of a = 0.05, that there has been an increase in the proportion of all kochia plants that areresistant to glyphosate?
