Abiology class takes a field trip to a field, and collects data on the biodiversity (the number of different plant and animal species) in their local ecosystem, each student randomly selects one square meter of ground, and counts all the different species of plants, animals, bugs, mold etc that are within that square meter, as well as the total number of organisms. student a finds 27 unique species in her square meter, and decides to use fermi estimation to speed up the rest of her data collection. if she counts 23 grass plants in 100 square centimeters, about how many grasses are there in her entire square meter? [assume the grass is evenly distributed]

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10