1. a) 0.1  b) 0.75  c) 0.25 

2. a) .6449  b) 4.025    c) 3.5 to 5.5 

3. b) 0.791  c) -0.1  d) no relationship 

4. a) 3.6 and 4.8 

5. a) 9   b) skip   c) right-skewed   d) mean > median 

6. b) price = -3730 + 54.77*Area  c) 51,040
   d) makes slope smaller, intercept higher 
   e) about 150,000 - 193,442 = about -40,000 

7. a) iii   b) i  c)  ii      

8. a) lurking variable = city size 
   b)  obs.study just observes, experiment forcefully assigns subjects (through random selection) to treatments
   c)  i.C,  ii.A, iii.B, iv.D
   d) i.population = all whole grain products 
      ii. sample = 25 selected products
	  iii. fiber content (numerical) 
   e) The sample is not random: the first 30 books are probably most popular. This might bias the price.