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