BUAL 2650 Exam 1 (Chen Yan - Auburn University) Questions and Answe
1. What is quantitative value that repre- Random Variable
sents the outcomes from an experi-
ment?
2. What are the 2 kinds of random vari- discrete (countable) and continuous (decimals)
ables?
3. What is the most common type of normal distribution
continuous probability distribution?
4. What are some other names for a probability curve and probability density function
continuous probability distribution? (pdf)
5. What is the total area under the curve 1 or 100%
if f(x) always equal to?
6. What is an area under a continuous a probability
probability distribution?
7. How many types of normal curves are an infinite amount
there?
8. What does the shape of any individual its specific mean and standard deviation (also medi-
normal curve depend on? an and mode)
9. What is the highest point over? the mean, median, mode
10. Is the normal curve symmetric? yes (left and right are mirror images)
11. What does a larger standard devia- makes it shorter and wider
tion do to a curve?
12. Do the tails of a normal curve ever no
touch the horizontal axis?
1/6
, BUAL 2650 Exam 1 (Chen Yan - Auburn University) Questions and Answe
Study online at https://quizlet.com/_id653n
13. What percent of the area under the 68.26
normal curve is within 1 standard de-
viation to the left and right?
14. What percent of the area under the 95.44
normal curve is within 2 standard de-
viation to the left and right?
15. What percent of the area under the 99.73
normal curve is within 3 standard de-
viation to the left and right?
16. How do you calculate a z-score? (value-mean)/standard deviation
17. What is the difference between x and x is normal distribution where z is standard normal
z? distribution
18. What is cumulative probability? means less than, the left side under curve
19. What must you do to find probability 1 - value from Z table
to the right of a Z score?
20. P (z< 2) 0.9772
21. P (z<1.25) 0.8944
22. P (z>2.3) 0.0107
23. P (-1 < z< 2) 0.8185
24. Suppose x is a normally distributed 0.9082
variable from N(300, 15). P(x>280)
25. Find Z0.025 1.96
2/6
1. What is quantitative value that repre- Random Variable
sents the outcomes from an experi-
ment?
2. What are the 2 kinds of random vari- discrete (countable) and continuous (decimals)
ables?
3. What is the most common type of normal distribution
continuous probability distribution?
4. What are some other names for a probability curve and probability density function
continuous probability distribution? (pdf)
5. What is the total area under the curve 1 or 100%
if f(x) always equal to?
6. What is an area under a continuous a probability
probability distribution?
7. How many types of normal curves are an infinite amount
there?
8. What does the shape of any individual its specific mean and standard deviation (also medi-
normal curve depend on? an and mode)
9. What is the highest point over? the mean, median, mode
10. Is the normal curve symmetric? yes (left and right are mirror images)
11. What does a larger standard devia- makes it shorter and wider
tion do to a curve?
12. Do the tails of a normal curve ever no
touch the horizontal axis?
1/6
, BUAL 2650 Exam 1 (Chen Yan - Auburn University) Questions and Answe
Study online at https://quizlet.com/_id653n
13. What percent of the area under the 68.26
normal curve is within 1 standard de-
viation to the left and right?
14. What percent of the area under the 95.44
normal curve is within 2 standard de-
viation to the left and right?
15. What percent of the area under the 99.73
normal curve is within 3 standard de-
viation to the left and right?
16. How do you calculate a z-score? (value-mean)/standard deviation
17. What is the difference between x and x is normal distribution where z is standard normal
z? distribution
18. What is cumulative probability? means less than, the left side under curve
19. What must you do to find probability 1 - value from Z table
to the right of a Z score?
20. P (z< 2) 0.9772
21. P (z<1.25) 0.8944
22. P (z>2.3) 0.0107
23. P (-1 < z< 2) 0.8185
24. Suppose x is a normally distributed 0.9082
variable from N(300, 15). P(x>280)
25. Find Z0.025 1.96
2/6
