Deck 5: Fundamentals of Statistics

Question 1

Life tests on a part give a population mean value of 3000 hours and a population standard deviation of 200 hours. If the data are normally distributed, what percent of the parts are above 3300 hours.

Answer 1

0.0668

Question 2

The peakedness of the data is called:

A) kurtosis
B) skewness
C) lepto
D) modal

Answer 2

A

Question 3

The distance between adjacent midpoints is called:

A) boundary
B) interval
C) midpoint
D) tally

Answer 3

B

Question 4

The type of frequency distribution which is most commonly found in quality work is:

A) hypergeometric
B) uniform
C) normal
D) bionomial

Question 5

Ungrouped data collected on the time to perform a clerical operation are 3.0, 7.0, 3.0, and 6.0 minutes. Determine the average, median, mode, and sample standard deviation. It is NOT necessary to show your work. Use the function keys on your
calculator.

Question 6

The extreme or limit values of a cell are called:

A) boundaries
B) midpoints
C) interval
D) tallies

Question 7

The number of cells in a frequency distribution is between:

A) 5 to 10
B) 10 to 5
C) 15 to 20
D) 5 to 20

Question 8

If the range or 400 observed values has a high of 360 kg and a low of 295 kg, the best cell interval is:

A) 3
B) 5
C) 9
D) 7

Question 9

A milk bottle has a lower specification of 4.0 liters and a standard deviation of 0.02 liters. The data are normally distributed. If 2.5% of the data is to be below the lower specification, where should the process center be located?

Question 10

A variable is:

A) a measurable quality characteristic
B) a "good-bad" type characteristic
C) synonymous with attribute
D) none of the above

Question 11

The product of 3.10 x .015 is:

A) 0.047
B) 0.046
C) 0.0465
D) 0.0460

Question 12

When an accurate measure of the dispersion is desired use the:

A) range
B) mean deviation
C) standard deviation
D) mode

Question 13

When a quick measure of the dispersion is desired, use the:

A) range
B) mean deviation
C) standard deviation
D) mode

Question 14

Given the frequency distribution, sketch a relative cumulative frequency histogram.Label the axis. (Cell midpoint, Frequency) = (1.0, 3) (4.0, 5) and (7.0, 4)