BUAL 2650 EXAM 1 CORRECT 100%
It is appropriate to use the uniform distribution to describe a continuous random
variable x when - ANSWERrelative frequencies of all possible values of x are about
the same
The normal approximation of the binomial distribution is appropriate when -
ANSWERnp ≥ 5 and n(1 - p) ≥ 5.
The mean of a standard normal distribution is always equal to ____ - ANSWER0
Given that the length an athlete throws a hammer is a normal random variable with
mean 50 feet and standard deviation 5 feet, what is the probability he throws it no
less than 55 feet? - ANSWER.1587
What is the probability that a standard normal random variable will be between .3
and 3.2? - ANSWER.3814
For nonnormal populations, as the sample size (n) _________, the distribution of
sample means approaches a(n) _______ distribution. - ANSWERincreases, normal
_______ says that if the sample size is sufficiently large, then the sample means are
approximately normally distributed. - ANSWERThe Central Limit Theorem
The fill weight of a certain brand of cereal is normally distributed with a mean of 910
grams and a standard deviation of 5 grams. We calculated the value of z for a
specific box of this brand of cereal, and the z value was negative. This negative z
value indicates that - ANSWERthe fill weight is less than 910 grams
Which of the following statements is not a property of the normal probability
distribution? - ANSWER95.44 percent of all possible observed values of the random
variable x are within plus or minus three standard deviations of population mean.
If the random variable x is normally distributed, ______ percent of all possible
observed values of x will be within three standard deviations of the mean. -
ANSWER99.73
The z value tells us the number of _____ that a value of x is from the mean. -
ANSWERstandard deviations
A continuous probability distribution having a rectangular shape, where the
probability is evenly distributed over an interval of numbers is a(n) ________
distribution. - ANSWERuniform
The specific shape of each normal distribution is determined by its ______ and
_____. - ANSWERmean and standard deviation
It is appropriate to use the uniform distribution to describe a continuous random
variable x when - ANSWERrelative frequencies of all possible values of x are about
the same
The normal approximation of the binomial distribution is appropriate when -
ANSWERnp ≥ 5 and n(1 - p) ≥ 5.
The mean of a standard normal distribution is always equal to ____ - ANSWER0
Given that the length an athlete throws a hammer is a normal random variable with
mean 50 feet and standard deviation 5 feet, what is the probability he throws it no
less than 55 feet? - ANSWER.1587
What is the probability that a standard normal random variable will be between .3
and 3.2? - ANSWER.3814
For nonnormal populations, as the sample size (n) _________, the distribution of
sample means approaches a(n) _______ distribution. - ANSWERincreases, normal
_______ says that if the sample size is sufficiently large, then the sample means are
approximately normally distributed. - ANSWERThe Central Limit Theorem
The fill weight of a certain brand of cereal is normally distributed with a mean of 910
grams and a standard deviation of 5 grams. We calculated the value of z for a
specific box of this brand of cereal, and the z value was negative. This negative z
value indicates that - ANSWERthe fill weight is less than 910 grams
Which of the following statements is not a property of the normal probability
distribution? - ANSWER95.44 percent of all possible observed values of the random
variable x are within plus or minus three standard deviations of population mean.
If the random variable x is normally distributed, ______ percent of all possible
observed values of x will be within three standard deviations of the mean. -
ANSWER99.73
The z value tells us the number of _____ that a value of x is from the mean. -
ANSWERstandard deviations
A continuous probability distribution having a rectangular shape, where the
probability is evenly distributed over an interval of numbers is a(n) ________
distribution. - ANSWERuniform
The specific shape of each normal distribution is determined by its ______ and
_____. - ANSWERmean and standard deviation
