BUAL 2650 Exam 1 |47 Complete Q’s and A’s
The ________ is a graphic that is used to visually check whether data come
from a normal population.
exponential plot
normal probability plot
box-and-whiskers plot
normal distribution graph - -normal probability plot
- It is appropriate to use the uniform distribution to describe a continuous
random variable x when
the area under the probability curve = 1.
the probability curve f(x) > 0.
the shape of the histogram of all possible values of x is nonsymmetrical.
relative frequencies of all possible values of x are about the same. - -d.
relative frequencies of all possible values of x are about the same.
- The normal approximation of the binomial distribution is appropriate when
np≥ 5.
n(1 −p) ≥ 5.
np≤ 5.
n(1 −p) ≤ 5 and np≤ 5.
np≥ 5 and n(1 −p) ≥ 5. - -np≥ 5 and n(1 −p) ≥ 5.
- The fill weight of a certain brand of adult 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
we made a mistake in our calculations, as z must always be a nonnegative
number.
the fill weight is more than 910 grams.
the fill weight is less than 910 grams.
the fill weight is equal to 910 grams.
the fill weight may be more or less than 910 grams depending on the value
of the standard deviation. - -the fill weight is less than 910 grams.
- Which of the following statements is not a property of the normal
probability distribution?
The normal distribution is symmetric.
, 95.44 percent of all possible observed values of the random variable x are
within plus or minus three standard deviations of the population mean.
The mean, median, and mode are equal.
The area under the normal curve to the right of the mean is equal to the
area under the normal curve to the left of the mean.
All of these answers are properties of the normal distribution. - -95.44
percent of all possible observed values of the random variable x are within
plus or minus three standard deviations of the 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.
68.26
95.44
99.73
100 - -99.73
- The z value tells us the number of ________ that a value of x is from the
mean.
variances
standard deviations
medians
standard means - -standard deviations
- A continuous probability distribution having a rectangular shape, where the
probability is evenly distributed over an interval of numbers is a(n) ________
distribution.
exponential
binomial
normal
uniform - -uniform
- The specific shape of each normal distribution is determined by its ________
and ________.
mean, standard deviation.
median, standard deviation
mean, variance
median, variance - -mean, standard deviation.
- The area under the curve of a valid continuous probability distribution
must ________.
The ________ is a graphic that is used to visually check whether data come
from a normal population.
exponential plot
normal probability plot
box-and-whiskers plot
normal distribution graph - -normal probability plot
- It is appropriate to use the uniform distribution to describe a continuous
random variable x when
the area under the probability curve = 1.
the probability curve f(x) > 0.
the shape of the histogram of all possible values of x is nonsymmetrical.
relative frequencies of all possible values of x are about the same. - -d.
relative frequencies of all possible values of x are about the same.
- The normal approximation of the binomial distribution is appropriate when
np≥ 5.
n(1 −p) ≥ 5.
np≤ 5.
n(1 −p) ≤ 5 and np≤ 5.
np≥ 5 and n(1 −p) ≥ 5. - -np≥ 5 and n(1 −p) ≥ 5.
- The fill weight of a certain brand of adult 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
we made a mistake in our calculations, as z must always be a nonnegative
number.
the fill weight is more than 910 grams.
the fill weight is less than 910 grams.
the fill weight is equal to 910 grams.
the fill weight may be more or less than 910 grams depending on the value
of the standard deviation. - -the fill weight is less than 910 grams.
- Which of the following statements is not a property of the normal
probability distribution?
The normal distribution is symmetric.
, 95.44 percent of all possible observed values of the random variable x are
within plus or minus three standard deviations of the population mean.
The mean, median, and mode are equal.
The area under the normal curve to the right of the mean is equal to the
area under the normal curve to the left of the mean.
All of these answers are properties of the normal distribution. - -95.44
percent of all possible observed values of the random variable x are within
plus or minus three standard deviations of the 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.
68.26
95.44
99.73
100 - -99.73
- The z value tells us the number of ________ that a value of x is from the
mean.
variances
standard deviations
medians
standard means - -standard deviations
- A continuous probability distribution having a rectangular shape, where the
probability is evenly distributed over an interval of numbers is a(n) ________
distribution.
exponential
binomial
normal
uniform - -uniform
- The specific shape of each normal distribution is determined by its ________
and ________.
mean, standard deviation.
median, standard deviation
mean, variance
median, variance - -mean, standard deviation.
- The area under the curve of a valid continuous probability distribution
must ________.
