Parker decides to spend an hour playing basketball rather than studying. His opportunity cost is:

Which of the following is true regarding Specialization?

What is the Budget Constraint Line?

Why do supply curves almost always slope up and to the right?

Figure 2-1 Refer to the Production Possibilities Frontier (PPF) in Figure 2-1.  Deciding to produce more Bread by reducing production of Wine is illustrated by the movement of: 

(h)  Decision Tree cannot handle irrelevant features in the training data. 

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ConConsider a table Product(id, cost) where id is a key. The table initially contains two tuples: (1, 100) and (2, 150). Two transactions execute concurrently as follows: Transaction T1: BEGIN TRANSACTION; A1: INSERT INTO Product VALUES (3, 200);A2: UPDATE Product SET cost = cost + 50 WHERE id = 1; COMMIT; Transaction T2: BEGIN TRANSACTION; B1: SELECT SUM(cost) AS s1 FROM Product;B2: SELECT SUM(cost) AS s2 FROM Product; COMMIT; Assume all statements execute atomically. Transaction T1 always uses isolation level Serializable. If Transaction T2 also uses Serializable, what possible pairs of values (s1, s2) can it return?  

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We are a new travel website which offers exclusive discounts from our partner resorts and tour groups to discerning clients that have a credit card with our parent corporation.  The number of offerings is not huge because we target only high end properties and exclusive tour groups for out clients.  We want to calculate the best index to make in our database to maximize performance for our customers who can assess the database through our website and view our travel offerings. Bookings are done in another systems once a customer is ready to book. We estimate that all of the database transaction for the table we are currently interested in can be placed into three query types. Q1: Queries that our clients execute that accesses information about travel destinations in a specific category (skiing, diving, adventure, luxury travel etc) Q2: Queries that our clients execute that access information about activities in a specific location which are broken down into either city or subcity sections depending on the city size (, Tokyo Ginza area, London Mayfair, Concord, Tampa etc) Q3: Queries that our sales team performs that add new resorts and tours organization to our partnership data base so the customers can discovery them.  Because we are new the addition of new clients has been rapid Assumptions about the data.  We have grown considerably and this table is currently 40 pages in length so if we have to access the entire database it required 40 pages reads. On average a location has 5 partner offerings and each category of offering is available in 20 different locations. Make the assumption that if we know the locations of each partner we still make 5 disk access for Q2 and if we know the locations of the offerings  in each category 20 disk access are required for Q1. One disk access is required to read any index we use and if we modify the database we must also modify the index (requiring both a read and a write (2 disk access)). We will also assume that if we modify the database we can find a blank page and will only require one disk access to read the page and one to write back the modified page. Given these assumptions would it be better to use no index, one index on locations, one index on offerings, or two indexes (both offerings and locations)? Action Frequency No index Index on offerings Index on Location Both index Q1: Category .30         Q2: Location .60         Q3: Update .10         Average           Calculate the average for each of the 4 options.  What is the lowest average (report to 1 decimal place e.g. XX.x)?