HW7 Solutions

2 points each, 58 points total

2.43

1. skewed right

2. skewed left

3. skewed right

4. symmetric

5. skewed right

6. skewed left

4.4

1. continuous

2. discrete

3. continuous

4. continuous

5. discrete

6. discrete

4.6

1. -4,0,1,3

2. 1

3. 0.7

4. 0

4.8

1. valid

2. not valid, probabilities don't add to one

3. not valid, negative probability

4. not valid, probabilities don't add to one

4.10

1. 0.10 + 0.15 + 0.40 = 0.65

2. 0.40 + 0.30 + 0.05 = 0.75

3. 0.15 + 0.40 + 0.30 = 0.85

4. 1 - 0.05 = 0.95

5. 0.40 + 0.30 = 0.70

6. 0.10 + 0.15 + 0.40 = 0.65

4.12

1. 0.2592

2. 0.0102 + 0.0768 = 0.0870

3. 0.3456 + 0.2592 + 0.0778 = 0.6826

E-mail Mr. Callahan at stat110@edcallahan.com with questions or comments about this web site or about the class itself.