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List at least 5 ways that bison wallows and carcasses influence prairie plant diversity and spatial heterogeneity. (number them 1-5)

About how many bison are there today?

Researchers want to test whether a diet and exercise program reduces the incidence of type 2 diabetes in high-risk adults over 10 years. Which study design is most appropriate?

In a double-blind clinical trial, which of the following is true?

Which statement correctly differentiates intent-to-treat (ITT) from per-protocol (PP) analysis?

A clinical trial participant experiences a serious adverse event (SAE). What is the sponsor’s PRIMARY obligation?

What is the overriding principle in the conduct of any clinical trial?

Consider a firm whose marginal cost of producing additional output is $20, and who charges a price of $25. What is this firm’s markup factor?

All firms operating in a competitive market have cost functions:

Consider an industry where the sales of the largest six firms are: $10, $10, $8, $6, $4, and $2. a) [2 points] Calculate the four-firm concentration ratio as well as the Herfindahl-Hirschman Index (HHI) for this industry. b) [2 points] Adjust the distribution of sales among the industry shown above to highlight that HHI accounts for the distribution of sales among the largest firms, while the concentration ratio does not.  Calculate the new HHI and four-firm concentration ratio. (keep the total sales, number of firms, and four-firm concentration ratio the same as part a) c) [2 points] Adjust the distribution of sales among the industry shown above to highlight that HHI accounts for sales outside the largest firms. Calculate the new HHI and four-firm concentration ratio (keep the total sales and four-firm concentration ratio the same as part a, but you can change the number of firms)