Deck 19: Probability and Statistics in Engineering

Question 1

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

Answer 1

C

Question 2

The cumulative frequency shows the cumulative number of students with scores up to and
including those in the given range.

Answer 2

True

Question 3

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.

Answer 3

C

Question 4

For any probability distribution, the sum of probabilities is always

A) 0
B) 0.5
C) 1
D) equal to the standard deviation.

Question 5

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.

Question 6

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.

Question 7

Something with a large number of data points is commonly called a

A) population.
B) group.
C) data set.
D) sample.

Question 8

The area under a normal distribution curve should always be equal to

A) 1
B) 0
C) the standard deviation.
D) the arithmetic mean.

Question 9

There are basically two types of observation errors:

A) personal and professional.
B) systemic and random.
C) partial and complete.
D) visual and measured.

Question 10

A random experiment is one that has random outcomes that cannot be predicted exactly.

Question 11

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

Question 12

In probability, each time you repeat an experiment is called a

A) trial.
B) test run.
C) measurement.
D) guess.

Question 13

A common way of measuring the dispersion of data is by calculating the

A) spread.
B) scattering.
C) mode.
D) variance.

Question 14

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.

Question 15

The result of an experiment is called

A) the end product.
B) an outcome.
C) the answer.
D) the product.

Question 16

The arithmetic average of a list of numbers is known as the

A) median.
B) mode.
C) mean.
D) root mean squared.

Question 17

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

Question 18

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.

Question 19

A smaller portion of the entire data or population is commonly called a

A) subset.
B) group.
C) data set.
D) sample.

Question 20

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

Question 21

For normal distribution, what percent of the data will fall in the interval of one standard deviation above and below the mean?