AP Statistics 2017

31. 
    

        d

    
    


32. e


33. a


34. c


35. a


36. a


37. c


38. e


39. c


40. b

SOLUTIONS TO DIAGNOSTIC TEST—SECTION I

1. 
   

            From    Chapter 10

   
   

   The correct answer is (c). If X has B (n, p ), then, in general,

   
   

In  this    problem,    n = 18, p = 0.4,    x = 7   so  that

2. From Chapter 7

The correct answer  is  (a).    ln  (y  )   =   3.2 +   0.42(7) =   6.14 y =    e 6.14 =    464.05.

3. 
   

            From    Chapter 11

   
   

   The correct answer is (e). For a 94% z -interval, there will be 6% of the area outside of the interval.
   That is, there will be 97% of the area less than the upper critical value of z . The nearest entry to 0.97
   in the table of standard normal probabilities is 0.9699, which corresponds to a z -score of 1.88.
   (Using the TI-83/84, we have invNorm(0.97) = 1.8808 .)

   
   


4. From Chapter 6
   The correct answer is (d). If the bar to the far left was not there, this graph would be described as
   approximately normal. It still has that same basic shape but, because there is an outlier, the best
   description is: approximately normal with an outlier.


5. From Chapter 9
   The correct answer is (c). Let x be the value in question. If there is 0.2 of the area above x , then there
   is 0.8 of the area to the left of x . This corresponds to a z -score of 0.84 (from Table A, the nearest
   entry is 0.7995). Hence,