d) Any measurement obtained known as a paramlr is 6. A researcher has converted

Question

d) Any measurement obtained known as a paramlr is 6. A researcher has converted all grades on this year's CPA exams into Z-scores. a) The average Z-score will be: b) If CPA exam scores are normally distributed, about and -1 c) If CPA exam scores are very skewed and not normally distributed, we still would expect at least d) You find out that the exam scores are normally distributed, and that your score on the exam is exactly +1.96. This means you scored higher than exam. % of scores will be between +1 % of the Z-scores to be between +2 and-2. % of the individuals who took the 7. The life of a Hyundai Dred car is normally distributed with a mean life of 15 years, and a population standard deviation of 2 years. What proportion of Hyundai Dreds will die within 10 years? 8. a) If P(A and B)- 0, then A and B are: b) If P(A B) P(A), then A and B are: c) Is P(A B) always equal to P(B|A)? d) Is P(A and B) always equal to P(B and A)? Practice Midterm Page 2

Explanation / Answer

a)0

b) 68% of scores

c)75% (from Chebychev's theorum)

d) 97.5% (As corresponding to 1.96 z score ; percentile value is 97.5)

7)

P(X<10) =P(Z<(10-15)/2) =P(Z<-2.5)=0.0062

8)

A and B are mutually exclusive

b) independent

c)No

d) Yes

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