Unformatted text preview: ss Statistics 144. A paint sprayer coats a metal surface with a layer of paint between 0.43 and 1.23
millimeters thick. The thickness of the coat of paint is approximately uniformly distributed.
What is the probability that paint from this sprayer on any given metal surface will be
between 0.75 and 1.05 millimeters thick?
A. .375
B. .181
C. .854
D. .610 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Easy
Topic: Uniform Distribution 145. The yearly cost of dental claims for the employees of the local shoe manufacturing
company is normally distributed with a mean of $105 and a standard deviation of $35. What
is the yearly cost at which 35% of the employees fall at or below?
A. $118.48
B. $127.29
C. $82.71
D. $91.53 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 1532 Chapter 01  An Introduction to Business Statistics 146. A plant manager knows that the number of boxes of supplies received weekly is
normally distributed with a mean of 200 and a standard deviation of 20. What percentage of
the time will the number of boxes received weekly be greater than 200
A. 100%
B. 25%
C. 0%
D. 50% AACSB: Analytical Studies
Bloom's: Application
Difficulty: Easy
Topic: Normal Distribution 147. A plant manager knows that the number of boxes of supplies received weekly is
normally distributed with a mean of 200 and a standard deviation of 20. What percentage of
the time will the number of boxes received weekly be less than 160?
A. 2.28%
B. 57.93%
C. 42.07%
D. 4.56% AACSB: Analytical Studies
Bloom's: Application
Difficulty: Easy
Topic: Normal Distribution 1533 Chapter 01  An Introduction to Business Statistics 148. A plant manager knows that the number of boxes of supplies received weekly is
normally distributed with a mean of 200 and a standard deviation of 20. What percentage of
the time will the number of boxes received weekly be between 180 and 210?
A. .6915
B. .1915
C. .5328
D. .1587 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 149. A plant manager knows that the number of boxes of supplies received weekly is
normally distributed with a mean of 200 and a standard deviation of 20. What percentage of
the time will the number of boxes received weekly be greater than 210 or Less than 180?
A. .6915
B. .4672
C. .1915
D. .1587 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 1534 Chapter 01  An Introduction to Business Statistics 150. Suppose the distribution of personal daily water usage in New York City is normally
distributed with a mean of 15 gallons and a variance of 25 gallons. Because of a current
problem with the distribution of water to its citizens, the mayor wants to give a city tax rebate
to the 15 percent of the population who use the least amount of water. What should he use as
the water limit for a person to qualify for a city tax rebate?
A. 9.825
B. 15.00
C. 12.20
D. 10.25 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution Chapter 07
Sampling and Sampling Distributions
True / False Questions 1. If we have a sample size of 100 and the estimate of the population proportion is .10, we can
estimate the sampling distribution of
with a normal distribution.
True False 2. A sample size of 500 is sufficiently large enough to conclude that the sampling distribution
of is a normal distribution, when the estimate of the population proportion is .995.
True False 3. The sampling distribution of
deviation 1.
True False must be a normal distribution with a mean 0 and standard 1535 Chapter 01  An Introduction to Business Statistics 4. For any sampled population, the population of all sample means is approximately normally
distributed.
True False 5. The sampling distribution of a sample statistic is the probability distribution of the
population of all possible values of the sample statistic.
True False 6. A sample statistic is an unbiased point estimate of a population parameter if the mean of the
populations of all possible values of the sample statistic equals the population parameter.
True False 1536 Chapter 01  An Introduction to Business Statistics 7. A minimum variance, unbiased point estimate has a variance that is as small or smaller than
the variances of any other unbiased point estimate.
True False 8. We can randomly select a sample from an infinite population of potential process
measurements by sampling the process at different and equally spaced time points.
True False 9. The reason sample variance has a divisor of n1 rather than n is that it makes the variance
an unbiased estimate of the population variance.
True False 10. The standard deviation of all possible sample proportions increases as the sample size
increases.
True False 11. The central limit theorem states that as sample size increases, the population distribution
more closely approximates a normal distribution.
True False 12. If a population is known to be normally distributed, then it follows that the sample
standard deviation must equal σ.
True False 13. If the sampled population is exactly normal distribution,...
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 Winter '14
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