Top Mark Questions and Correct Verified Answers
BANA 2372 Business Analysis/Statistics
- Exam 2 Practice Questions Questions
and Correct Verified Answers
___ of values of a normal random variable are within +/- 1 standard deviation of the
mean.
✓ 68.26%
___ of values of a normal random variable are within +/- 2 standard deviation of the
mean.
✓ 95.44%
___ of values of a normal random variable are within +/- 3 standard deviation of the
mean.
✓ 99.72%
___ is referred to as the rectangular distribution.
✓ Uniform distribution
___is a continuous probability distribution and explains the probability distribution of
the time between random occurrences.
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
✓ Exponential probability distribution
1 /10 10 x f x e , where x 0
The mean of x is ____.
The probability that x is less than 5 is ____.
✓ 10; 0.0606
23% of executives believe an employer has no right to read employee's email. With a
sample size of 1200 construct a 90% confidence interval for the proportion.
Does this sample satisfy the necessary conditions such that the distribution of sample
proportions is approximately normal?
✓ yes
A college entrance exam scores the following normal distribution with a mean of 540
and a standard deviation of 60. About 68% of students taking the exam will score
within what range?
✓ 480 to 600
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
A continuous probability distribution that is useful in describing the time, or space,
between occurrences of an event is a(n)
✓ exponential probability distribution
A continuous random variable can assume any value in an interval on the real line or in
a collection of intervals.
✓ True
A continuous random variable is uniformly distributed between a and b. The probability
density function between a and b is _____.
✓ 1/(b − a)
A continuous random variable may assume _____.
✓ all values in an interval or collection of intervals
A continuous uniform random variable x has a lower bound of a = -3, an upper bound of
b = 5. What is p(x > -1)?
✓ 0.7500
A continuous uniform random variable x has a lower bound of a = -21, an upper bound
of b = -6. What value of x provides an area in the upper tail equal to 0.20?
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
✓ -9
A health conscious student faithfully wears a device that tracks his steps. Suppose that
the number of steps he takes is normally distributed with a mean of 10,000 and a
standard deviation of 1500 steps. How many steps would he have to take to make the
cut for the top 5% for his distribution?
✓ 12,467
A health conscious student faithfully wears a device that tracks his steps. Suppose that
the number of steps he takes is normally distributed with a mean of 10,000 and a
standard deviation of 1500 steps. One day he took 15,000 steps. What was his
percentage of steps that day?
✓ 99.96%
A health conscious student faithfully wears a device that tracks his steps. Suppose that
the number of steps he takes is normally distributed with a mean of 10,000 and a
standard deviation of 1500 steps. What percent of the time will he exceed 13,000 steps?
✓ 2.28%
A mean of 0 and a standard deviation of 1
✓ minus infinity to infinity
Top Mark !!!
BANA 2372 Business Analysis/Statistics
- Exam 2 Practice Questions Questions
and Correct Verified Answers
___ of values of a normal random variable are within +/- 1 standard deviation of the
mean.
✓ 68.26%
___ of values of a normal random variable are within +/- 2 standard deviation of the
mean.
✓ 95.44%
___ of values of a normal random variable are within +/- 3 standard deviation of the
mean.
✓ 99.72%
___ is referred to as the rectangular distribution.
✓ Uniform distribution
___is a continuous probability distribution and explains the probability distribution of
the time between random occurrences.
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
✓ Exponential probability distribution
1 /10 10 x f x e , where x 0
The mean of x is ____.
The probability that x is less than 5 is ____.
✓ 10; 0.0606
23% of executives believe an employer has no right to read employee's email. With a
sample size of 1200 construct a 90% confidence interval for the proportion.
Does this sample satisfy the necessary conditions such that the distribution of sample
proportions is approximately normal?
✓ yes
A college entrance exam scores the following normal distribution with a mean of 540
and a standard deviation of 60. About 68% of students taking the exam will score
within what range?
✓ 480 to 600
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
A continuous probability distribution that is useful in describing the time, or space,
between occurrences of an event is a(n)
✓ exponential probability distribution
A continuous random variable can assume any value in an interval on the real line or in
a collection of intervals.
✓ True
A continuous random variable is uniformly distributed between a and b. The probability
density function between a and b is _____.
✓ 1/(b − a)
A continuous random variable may assume _____.
✓ all values in an interval or collection of intervals
A continuous uniform random variable x has a lower bound of a = -3, an upper bound of
b = 5. What is p(x > -1)?
✓ 0.7500
A continuous uniform random variable x has a lower bound of a = -21, an upper bound
of b = -6. What value of x provides an area in the upper tail equal to 0.20?
Top Mark !!!
, Top Mark Questions and Correct Verified Answers
✓ -9
A health conscious student faithfully wears a device that tracks his steps. Suppose that
the number of steps he takes is normally distributed with a mean of 10,000 and a
standard deviation of 1500 steps. How many steps would he have to take to make the
cut for the top 5% for his distribution?
✓ 12,467
A health conscious student faithfully wears a device that tracks his steps. Suppose that
the number of steps he takes is normally distributed with a mean of 10,000 and a
standard deviation of 1500 steps. One day he took 15,000 steps. What was his
percentage of steps that day?
✓ 99.96%
A health conscious student faithfully wears a device that tracks his steps. Suppose that
the number of steps he takes is normally distributed with a mean of 10,000 and a
standard deviation of 1500 steps. What percent of the time will he exceed 13,000 steps?
✓ 2.28%
A mean of 0 and a standard deviation of 1
✓ minus infinity to infinity
Top Mark !!!
