BUAL 2650 EXAM 1 (CHEN YAN - AUBURN
UNIVERSITY) | QUESTIONS AND ANSWERS | 100%
CORRECT!!
What is quantitative value that represents the outcomes from an experiment?
Answer - Random Variable
What are the 2 kinds of random variables? Answer - discrete (countable) and
continuous (decimals)
What is the most common type of continuous probability distribution? Answer
- normal distribution
What are some other names for a continuous probability distribution? Answer
- probability curve and probability density function (pdf)
What is the total area under the curve if f(x) always equal to? Answer - 1 or
100%
What is an area under a continuous probability distribution? Answer - a
probability
How many types of normal curves are there? Answer - an infinite amount
, What does the shape of any individual normal curve depend on? Answer - its
specific mean and standard deviation (also median and mode)
What is the highest point over? Answer - the mean, median, mode
Is the normal curve symmetric? Answer - yes (left and right are mirror images)
What does a larger standard deviation do to a curve? Answer - makes it
shorter and wider
Do the tails of a normal curve ever touch the horizontal axis? Answer - no
What percent of the area under the normal curve is within 1 standard
deviation to the left and right? Answer - 68.26
What percent of the area under the normal curve is within 2 standard
deviation to the left and right? Answer - 95.44
What percent of the area under the normal curve is within 3 standard
deviation to the left and right? Answer - 99.73
How do you calculate a z-score? Answer - (value-mean)/standard deviation
What is the difference between x and z? Answer - x is normal distribution
where z is standard normal distribution
What is cumulative probability? Answer - means less than, the left side under
curve
UNIVERSITY) | QUESTIONS AND ANSWERS | 100%
CORRECT!!
What is quantitative value that represents the outcomes from an experiment?
Answer - Random Variable
What are the 2 kinds of random variables? Answer - discrete (countable) and
continuous (decimals)
What is the most common type of continuous probability distribution? Answer
- normal distribution
What are some other names for a continuous probability distribution? Answer
- probability curve and probability density function (pdf)
What is the total area under the curve if f(x) always equal to? Answer - 1 or
100%
What is an area under a continuous probability distribution? Answer - a
probability
How many types of normal curves are there? Answer - an infinite amount
, What does the shape of any individual normal curve depend on? Answer - its
specific mean and standard deviation (also median and mode)
What is the highest point over? Answer - the mean, median, mode
Is the normal curve symmetric? Answer - yes (left and right are mirror images)
What does a larger standard deviation do to a curve? Answer - makes it
shorter and wider
Do the tails of a normal curve ever touch the horizontal axis? Answer - no
What percent of the area under the normal curve is within 1 standard
deviation to the left and right? Answer - 68.26
What percent of the area under the normal curve is within 2 standard
deviation to the left and right? Answer - 95.44
What percent of the area under the normal curve is within 3 standard
deviation to the left and right? Answer - 99.73
How do you calculate a z-score? Answer - (value-mean)/standard deviation
What is the difference between x and z? Answer - x is normal distribution
where z is standard normal distribution
What is cumulative probability? Answer - means less than, the left side under
curve
