# Quiz 19: Probability and Statistics in Engineering

Engineering

Q 1Q 1

Civil engineers use statistical models to study the reliability of construction materials and structures and to design for flood control and water supply management.

Free

True False

True

Q 2Q 2

Manufacturing engineers use statistics for quality control assurance of the products they produce.

Free

True False

True

Q 3Q 3

In probability, each time you repeat an experiment is called a
A)trial
B)test run
C)measurement
D)guess

Free

Multiple Choice

A

Q 4Q 4

In probability, the result of an experiment is called
A)the end product
B)an outcome
C)the answer
D)the product

Free

Multiple Choice

Q 5Q 5

In probability, a random experiment is one that has random outcomes that cannot be predicted exactly.

Free

True False

Q 6Q 6

This question has four possible answers listed below and only one of them is correct.If you select one at random, what is the probability that you pick the correct answer?
A)0.75
B)0.50
C)0.25
D)0.10

Free

Multiple Choice

Q 7Q 7

This question has four possible answers listed below and only one of them is correct.If you select one at random, what are the odds that you pick the correct answer?
A)1:2
B)1:3
C)1:4
D)1:5

Free

Multiple Choice

Q 8Q 8

There are 20 red marbles and 10 blue marbles mixed together in a cloth bag.If you reach in and pull out a marble, without looking, what is the probability of selecting a blue marble?
A)0.75
B)0.50
C)0.25
D)0.33

Free

Multiple Choice

Q 9Q 9

There are 20 red marbles and 10 blue marbles mixed together in a cloth bag.If you reach in and pull out a marble, without looking, what are the odds of selecting a blue marble?
A)1:2
B)1:3
C)1:4
D)1:5

Free

Multiple Choice

Q 10Q 10

That area of science that deals with collection, organization, analysis, and interpretation of data is known as
A)probability
B)statics
C)statistics
D)mathematics

Free

Multiple Choice

Q 11Q 11

Statistics deals with methods and techniques that can be used to draw conclusions about the characteristics of something with a large number of data points sing a smaller portion of the entire data.

Free

True False

Q 12Q 12

In statistics, something with a large number of data points is commonly called a
A)population
B)group
C)data set
D)sample

Free

Multiple Choice

Q 13Q 13

In statistics, smaller portion of the entire data or population is commonly called a
A)subset
B)group
C)data set
D)sample

Free

Multiple Choice

Q 14Q 14

One simple way of organizing the data better would be to identify the lowest and the highest values, and then group the data into equal intervals or ranges:

Free

True False

Q 15Q 15

In statistics, one way of showing the range of values and their frequency is by showing a mean value.

Free

True False

Q 16Q 16

A histogram is a way to show the range of data and their frequency.The height of the bars shows the frequency of the data within the given ranges.

Free

True False

Q 17Q 17

The cumulative frequency does not show the cumulative number of data with values up to and including those in the given range.

Free

True False

Q 18Q 18

There are basically two types of observation errors:
A)personal and professional.
B)systemic and random.
C)partial and complete.
D)visual and measured.

Free

Multiple Choice

Q 19Q 19

Systemic errors are errors
A)that occur throughout the entire system.
B)that occur on a frequent basis.
C)associated with using an inaccurate instrument.
D)associated with the design and setup of the experiment.

Free

Multiple Choice

Q 20Q 20

Random errors
A)can be detected and avoided by properly calibrating instruments.
B)are generated by a number of unpredictable variations.
C)rarely occur in a properly designed experiment.
D)can be removed from the data set through proper statistical analysis.

Free

Multiple Choice

Q 21Q 21

The arithmetic average of a list of numbers is known as the
A)median
B)mode
C)mean
D)root mean squared

Free

Multiple Choice

Q 22Q 22

A list of temperature readings (in degrees Celsius) is shown below.Calculate the mean temperature:
72, 76, 81, 69, 73, 76, 75, 82, 83, 68, 69, 76, 74, 65, 62

Free

Essay

Q 23Q 23

Median is the value in the middle of a data.It is that value that separates the higher half of the data from its lower half.

Free

True False

Q 24Q 24

A list of temperature readings (in degrees Celsius) is shown below.Calculate the median temperature:
72, 76, 81, 69, 73, 76, 75, 82, 83, 68, 69, 76, 74, 65, 62

Free

Essay

Q 25Q 25

A common way of measuring the dispersion of data is by calculating the
A)spread
B)scattering
C)mode
D)variance

Free

Multiple Choice

Q 26Q 26

The standard deviation is
A)the square root of the variance.
B)the square of the variance.
C)the root mean squared of the variance.
D)the absolute value of the variance.

Free

Multiple Choice

Q 27Q 27

A list of temperature readings (in degrees Celsius) is shown below.Calculate the variance for these data:
72, 76, 81, 69, 73, 76, 75, 82, 83, 68, 69, 76, 74, 65, 62

Free

Essay

Q 28Q 28

A list of temperature readings (in degrees Celsius) is shown below.Calculate the standard deviation for these data:
72, 76, 81, 69, 73, 76, 75, 82, 83, 68, 69, 76, 74, 65, 62

Free

Essay

Q 29Q 29

A probability distribution shows the probability values for the occurrence of the outcomes of an experiment.A probability distribution that has a bell-shaped curve is called a normal distribution.

Free

True False

Q 30Q 30

For any probability distribution, the sum of probabilities is always
A)0
B)0.5
C)1
D)equal to the standard deviation.

Free

Multiple Choice

Q 31Q 31

The probability distribution for many engineering experiments is approximated by
A)the average (mean) value of the data.
B)a normal distribution.
C)the standard deviation.
D)none of the above.

Free

Multiple Choice

Q 32Q 32

The detailed shape of a normal-distribution curve is determined by its mean and standard deviation values.An experiment with a small standard deviation will produce a tall, narrow curve; whereas a large standard deviation will result in a short, wide curve.

Free

True False

Q 33Q 33

The area under a normal distribution curve should always be equal to
A)1
B)0
C)the standard deviation.
D)the arithmetic mean.

Free

Multiple Choice

Q 34Q 34

In statistics, it is customary to normalize the mean and the standard deviation values of an experiment and work with what is called the standard normal distribution, which has a mean value of zero and a standard deviation value of 1.

Free

True False

Q 35Q 35

For normal distribution, what percentage of the data will fall in the interval of one standard deviation above and below the mean?
A)50%
B)65%
C)68%
D)95%

Free

Multiple Choice

Q 36Q 36

For normal distribution, what percentage of the data will fall in the interval of two standard deviations above and below the mean?
A)50%
B)65%
C)68%
D)95%

Free

Multiple Choice