BUAL 2650 EXAM 1QUESTIONS &
ANSWERS(RATED A+)
What is quantitative value that represents the outcomes from an experiment? -
ANSWERRandom Variable
What are the 2 kinds of random variables? - ANSWERdiscrete (countable) and
continuous (decimals)
What is the most common type of continuous probability distribution? -
ANSWERnormal distribution
What are some other names for a continuous probability distribution? -
ANSWERprobability curve and probability density function (pdf)
What is the total area under the curve if f(x) always equal to? - ANSWER1 or 100%
What is an area under a continuous probability distribution? - ANSWERa probability
How many types of normal curves are there? - ANSWERan infinite amount
What does the shape of any individual normal curve depend on? - ANSWERits
specific mean and standard deviation (also median and mode)
What is the point estimation for sample standard deviation? - ANSWERS
What is the point estimation for sample proportion? - ANSWERp-hat
Mxbar = ? - ANSWERM
Standard deviation of the sample = ? - ANSWERstandard deviation / square root of n
How large does a sample size have to be in order to be considered normal? -
ANSWER30
Central Limit Theorem - ANSWERIf all samples of a particular size are selected from
any population, the sampling distribution of the sample mean is approximately a
normal distribution. This approximation improves with larger samples.
What is the highest point over? - ANSWERthe mean, median, mode
Is the normal curve symmetric? - ANSWERyes (left and right are mirror images)
What does a larger standard deviation do to a curve? - ANSWERmakes it shorter
and wider
ANSWERS(RATED A+)
What is quantitative value that represents the outcomes from an experiment? -
ANSWERRandom Variable
What are the 2 kinds of random variables? - ANSWERdiscrete (countable) and
continuous (decimals)
What is the most common type of continuous probability distribution? -
ANSWERnormal distribution
What are some other names for a continuous probability distribution? -
ANSWERprobability curve and probability density function (pdf)
What is the total area under the curve if f(x) always equal to? - ANSWER1 or 100%
What is an area under a continuous probability distribution? - ANSWERa probability
How many types of normal curves are there? - ANSWERan infinite amount
What does the shape of any individual normal curve depend on? - ANSWERits
specific mean and standard deviation (also median and mode)
What is the point estimation for sample standard deviation? - ANSWERS
What is the point estimation for sample proportion? - ANSWERp-hat
Mxbar = ? - ANSWERM
Standard deviation of the sample = ? - ANSWERstandard deviation / square root of n
How large does a sample size have to be in order to be considered normal? -
ANSWER30
Central Limit Theorem - ANSWERIf all samples of a particular size are selected from
any population, the sampling distribution of the sample mean is approximately a
normal distribution. This approximation improves with larger samples.
What is the highest point over? - ANSWERthe mean, median, mode
Is the normal curve symmetric? - ANSWERyes (left and right are mirror images)
What does a larger standard deviation do to a curve? - ANSWERmakes it shorter
and wider
