STAT 2500 Midterm: STAT 2500 Midterm Winter 2003

• School: Memorial University
• Department: Mathematics and Statistics
• Course: STAT 2500
• Professor: All

Document Summary

Circle one and only one letter below for your answers. Assuming the elapsing time (x) for the student population is normal. Assuming the distribution of elapsing time (x) for the student population is unknown. If a random sample of size 100 is taken, the probability value of p {19 x 21} is: (a) 0. 9544 (b) 0. 0082 (c) 0. 6826 (d) 0. 9918 (e) 0. 5082. The the probability p {10 < x . 11} is: (a) 0. 6915 (b) 0. 3085 (c) 0. 3830 (d) 0. 1170 (e) 0. 1915: suppose that the random variable x n ( = 50, 2 = 9). What are the mean ( ) and variance ( 2) of this probability distribution? (a) 3. 80 & 16. 25 (b) 4. 25 & 16. 25 (c) 4. 25 & 10. 56 (d) 3. 80 & 10. 56 (e) 3. 80 & 25. 00. Assuming that we can use normal approximation to calculate probabilities associated with this binomial random variable.