BUAL 2650 exam 1 |41 Questions
with Solutions
Consider a normal population with a mean of 10 and a variance of 4. Find P(X
≥ 10).
Multiple Choice
−.50
.00
.50
1.00 - -.50
- ________ values of the standard deviation result in a normal curve that is
narrower and more peaked.
Multiple Choice
Uniform
Equal
Larger
Smaller - -Smaller
- What is the probability that a standard normal random variable will be
between −2 and 2?
Multiple Choice
.4772
.9544
.0228
.9772 - -.9544
- Consider a normal population with a mean of 10 and a variance of 4. Find
P(X < 6).
Multiple Choice
.9772
.8413
.1587
.0228 - -.0228
- Values of the standard normal random variable are measured
Multiple Choice
in the number of standard deviations from the mean.
in the units in which the mean is measured.
, in squared units in which the mean is measured.
None of these answers are correct. - -in the number of standard deviations
from the mean
- An aptitude test has a mean score of 80 and a standard deviation of 5. The
population of scores is normally distributed. What proportion of tests has
scores over 90?
Multiple Choice
.0228
.9544
.0456
.9772 - -.0228
- Which of the following statements is not a property of the normal
probability distribution?
Multiple Choice
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.
All of these answers are properties of the normal distribution.
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.
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.
- Consider a normal population with a mean of 10 and a variance of 4. Find
P(X > 7).
Multiple Choice
.9332
.1587
.8413
.0668 - -.9332
- ________ values of the standard deviation result in a normal curve that is
wider and flatter.
Multiple Choice
Uniform
Equal
Larger
Smaller - -Larger
with Solutions
Consider a normal population with a mean of 10 and a variance of 4. Find P(X
≥ 10).
Multiple Choice
−.50
.00
.50
1.00 - -.50
- ________ values of the standard deviation result in a normal curve that is
narrower and more peaked.
Multiple Choice
Uniform
Equal
Larger
Smaller - -Smaller
- What is the probability that a standard normal random variable will be
between −2 and 2?
Multiple Choice
.4772
.9544
.0228
.9772 - -.9544
- Consider a normal population with a mean of 10 and a variance of 4. Find
P(X < 6).
Multiple Choice
.9772
.8413
.1587
.0228 - -.0228
- Values of the standard normal random variable are measured
Multiple Choice
in the number of standard deviations from the mean.
in the units in which the mean is measured.
, in squared units in which the mean is measured.
None of these answers are correct. - -in the number of standard deviations
from the mean
- An aptitude test has a mean score of 80 and a standard deviation of 5. The
population of scores is normally distributed. What proportion of tests has
scores over 90?
Multiple Choice
.0228
.9544
.0456
.9772 - -.0228
- Which of the following statements is not a property of the normal
probability distribution?
Multiple Choice
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.
All of these answers are properties of the normal distribution.
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.
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.
- Consider a normal population with a mean of 10 and a variance of 4. Find
P(X > 7).
Multiple Choice
.9332
.1587
.8413
.0668 - -.9332
- ________ values of the standard deviation result in a normal curve that is
wider and flatter.
Multiple Choice
Uniform
Equal
Larger
Smaller - -Larger
