BUAL 2650 Exam 1 Review - Gupta
Study online at https://quizlet.com/_ch1o0l
1. It is appropriate to use the uniform distribution to relative frequencies of all
describe a continuous random variable x when possible values of x are
about the same.
2. The normal approximation of the binomial distribution np e5 and n(1 − p) e5.
is appropriate when
3. The fill weight of a certain brand of adult cereal is the fill weight is less than
normally distributed with a mean of 910 grams and a 910 grams.
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
4. Which of the following statements is not a property of 95.44 percent of all pos-
the normal probability distribution? sible observed values of
the random variable x are
within plus or minus three
standard deviations of the
population mean.
5. If the random variable x is normally distributed, ______ 99.73
percent of all possible observed values of x will be
within three standard deviations of the mean.
6. The z value tells us the number of ________ that a value standard deviations
of x is from the mean.
7. A continuous probability distribution having a rectan- uniform
gular shape, where the probability is evenly distributed
over an interval of numbers is a(n) ________ distribution.
8. The specific shape of each normal distribution is deter- mean, standard deviation.
mined by its ________ and ________.
1/7
, BUAL 2650 Exam 1 Review - Gupta
Study online at https://quizlet.com/_ch1o0l
9. The area under the curve of a valid continuous proba- equal 1
bility distribution must ________.
10. ________ values of the standard deviation result in a Larger
normal curve that is wider and flatter.
11. The mean of a standard normal distribution is always 0
equal to ________.
12. For nonnormal populations, as the sample size (n) increases, normal
________, the distribution of sample means approaches
a(n) ________ distribution.
13. ________ says that if the sample size is sufficiently large, The Central Limit Theorem
then the sample means are approximately normally
distributed.
14. The exact spread of the t distribution depends on the number of degrees of
________. freedom
15. When the population is normally distributed, popula- the t distribution.
tion standard deviation σ is unknown, and the sample
size is n = 15, the confidence interval for the population
mean μ is based on
16. As the standard deviation (σ) decreases, the width of decreases
the confidence interval ________.
17. A confidence interval for the population mean is an sample mean
interval constructed around the ________.
18. In a manufacturing process, a random sample of 9 2.8140 to 3.1860
manufactured bolts has a mean length of 3 inches with [x¯ ± tα/2, n−1(s/n−−)]=
a variance of .09 and is normally distributed. What is
2/7
Study online at https://quizlet.com/_ch1o0l
1. It is appropriate to use the uniform distribution to relative frequencies of all
describe a continuous random variable x when possible values of x are
about the same.
2. The normal approximation of the binomial distribution np e5 and n(1 − p) e5.
is appropriate when
3. The fill weight of a certain brand of adult cereal is the fill weight is less than
normally distributed with a mean of 910 grams and a 910 grams.
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
4. Which of the following statements is not a property of 95.44 percent of all pos-
the normal probability distribution? sible observed values of
the random variable x are
within plus or minus three
standard deviations of the
population mean.
5. If the random variable x is normally distributed, ______ 99.73
percent of all possible observed values of x will be
within three standard deviations of the mean.
6. The z value tells us the number of ________ that a value standard deviations
of x is from the mean.
7. A continuous probability distribution having a rectan- uniform
gular shape, where the probability is evenly distributed
over an interval of numbers is a(n) ________ distribution.
8. The specific shape of each normal distribution is deter- mean, standard deviation.
mined by its ________ and ________.
1/7
, BUAL 2650 Exam 1 Review - Gupta
Study online at https://quizlet.com/_ch1o0l
9. The area under the curve of a valid continuous proba- equal 1
bility distribution must ________.
10. ________ values of the standard deviation result in a Larger
normal curve that is wider and flatter.
11. The mean of a standard normal distribution is always 0
equal to ________.
12. For nonnormal populations, as the sample size (n) increases, normal
________, the distribution of sample means approaches
a(n) ________ distribution.
13. ________ says that if the sample size is sufficiently large, The Central Limit Theorem
then the sample means are approximately normally
distributed.
14. The exact spread of the t distribution depends on the number of degrees of
________. freedom
15. When the population is normally distributed, popula- the t distribution.
tion standard deviation σ is unknown, and the sample
size is n = 15, the confidence interval for the population
mean μ is based on
16. As the standard deviation (σ) decreases, the width of decreases
the confidence interval ________.
17. A confidence interval for the population mean is an sample mean
interval constructed around the ________.
18. In a manufacturing process, a random sample of 9 2.8140 to 3.1860
manufactured bolts has a mean length of 3 inches with [x¯ ± tα/2, n−1(s/n−−)]=
a variance of .09 and is normally distributed. What is
2/7
