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Answer Key: Sample Test 1. Problem 10
 

Summary: Answer Key:
Sample Test 1. Problem 10
Mean: 2.05 phones Standard Deviation: 1.0234 phones
Sample Test 2. Problem 1a
Mean: 2.264 points of GPA Standard Deviation: 1.0101 points of GPA
Sample Test 2. Problem 3
a. i) 6/36=1/6, ii) 9/36=1/4, iii) 3/36=1/12, iv) 12/36=1/3.
b. Disjoint pair of events: only ii.
c. Independent pair of events: only iv
Sample Test 2. Problem 4
Yes No Total
Yes 40% 5% 45%
No 40% 15% 55%
Total 80% 20% 100%
(a) 5% (b) 60%
Sample Test 2. Problem 5
Have Lyme Disease?
Yes No Total
Test is positive 3.92% 2.88% 6.8%
Test is negative 0.08% 93.12% 93.2%

  

Source: Abrego, Bernardo - Department of Mathematics, California State University, Northridge

 

Collections: Mathematics