Volume 3 Ures

Front 1

A natural number is stated as a positive number that

Back 1

has any actual value from zero to infinity

Front 2

When using natural numbers, a number placed directly behind brackets, with no sign of operation between, indicates that

Back 2

the quantity within the brackets must be multiplied by that number

Front 3

Which phrase is true regarding signed numbers?

Back 3

Both positive and negative numbers have values.

Front 4

Which statistical technique is an example of descriptive statistics?

Back 4

Measurement scales

Front 5

In the equation Y=X+2, what does the symbol "Y" represent?

Back 5

Variable.

Front 6

A sample of a population that is taken in such a manner that each value has an equal chance of being selected is referred to as a

Back 6

random sample

Front 7

If you construct a QLP retrieval to select every 8th record, you are using which sampling technique?

Back 7

Systematic

Front 8

Which measurement scale consists of equal intervals between scale values and an arbitrary zero point?

Back 8

Interval

Front 9

You are given two pieces of test equipment that must be loaded on a pallet. One piece weighs 125 pounds and the other piece weighs 3.5 times as much. Using the ratio measurement scale, how much does the second piece of equipment weigh?

Back 9

437.5 pounds

Front 10

Given measurements of 5.0 hours, 10.0 hours, 15.0 hours, and 20.0 hours, what type of data and measurement scale would you use to classify these data items?

Back 10

Continuous; ratio.

Front 11

The second step in making a frequency distribution is to

Back 11

determine the class interval size.

Front 12

One way of comparing class frequencies to the total frequency is by

Back 12

percentage

Front 13

What does each rectangle in a histogram represent?

Back 13

One class of data

Front 14

When constructing a frequency polygon, what are plotted against the corresponding midpoints?

Back 14

Frequencies of the various class intervals

Front 15

What measure of central tendency is the most typical value in a distribution?

Back 15

Mode

Front 16

The mode is the only measure of central tendency that can be used with what measurement scale?

Back 16

Nominal

Front 17

Analysts frequently use the median because it is easy to compute and gives a better picture of data than the mean and mode when data are

Back 17

skewed

Front 18

The median cannot be used with data from which measurement scale?

Back 18

Nominal

Front 19

What must you do first to determine the median from ungrouped data?

Back 19

Arrange the data in ascending order

Front 20

The harmonic mean is used primarily for averaging

Back 20

rates

Front 21

The arithmetic mean should be weighted when

Back 21

a mean of means is desired

Front 22

Three workers perform a similar task. Worker A takes 30 minutes to complete the task and can finish 2 jobs per hour. Worker B takes 20 minutes to complete the task and can complete 3 jobs per hour. Worker C takes 40 minutes to complete the task, and completes 1.5 jobs per hour. Which calculation method will you use to find the average time it takes to complete the job?

Back 22

Harmonic mean

Front 23

A unique feature of the harmonic mean is it

Back 23

will always be less than the arithmetic mean

Front 24

For any distribution, the sum of the deviations is

Back 24

zero

Front 25

As the number of values in a normal distribution sample decreases, the standard deviation

Back 25

becomes less representative of the population

Front 26

Given a large number of random samples, the mean of all the samples means related to the population mean is

Back 26

the same

Front 27

In estimating the standard error of the mean, for what sample size do you use n-1 in the formula?

Back 27

Less than 30.

Front 28

A normal distribution contains what two parameters?

Back 28

Mean and standard deviation.

Front 29

In a normal distribution, how many standard deviations on each side of the mean contain over 99 percent of the area under the normal area curve within?

Back 29

3

Front 30

When plotted on normal probability graph paper, data from a normal distribution shows up as a

Back 30

straight line

Front 31

Where does the most frequent value of a normal curve occur?

Back 31

At the center of the distribution

Front 32

The causes of variation that can be identified on a control chart, regulated, and possibly eliminated are

Back 32

assignable

Front 33

The purpose of a control chart in statistics is to

Back 33

detect the presence of assignable causes for variation

Front 34

When identifying processes out of control and using a control chart, what action should you take if you have set your control limits at three standard deviations and later find not enough time is spent looking for assignable causes?

Back 34

Switch to tighter limits

Front 35

In statistical terms, what does the control chart for plotting individual X values use for the centerline?

Back 35

Mean

Front 36

The statistical interpretation of a control chart for individuals would be distorted if the

Back 36

distribution is extremely skewed

Front 37

A statistical chart for averages is used to plot

Back 37

means of small samples

Front 38

What characteristic of the distribution used in a control chart for averages gives it an advantage over a chart for individuals?

Back 38

The distribution of means tends to be normal.

Front 39

Which statistical chart measures changes in the means of a series?

Back 39

Chart for averages

Front 40

What subgroup sample size is commonly used when constructing a statistical range chart?

Back 40

4 or 5

Front 41

What statistical control chart is used to plot the percent of defective items?

Back 41

P chart

Front 42

On a P chart in statistics, changes in sample size are affected by the

Back 42

control limits

Front 43

In statistics, a C chart may be used to measure the

Back 43

number of defects per unit

Front 44

In statistics, one difference between a C chart and a P chart is the C chart

Back 44

sample size must remain constant

Front 45

In statistics, a range chart is normally used with a

Back 45

chart for averages

Front 46

In statistics, what are the two control charts for attributes?

Back 46

C and P charts

Front 47

On what statistical control chart is the number of defects per unit plotted?

Back 47

C chart

Front 48

In predictive analysis, a coefficient of correlation indicates

Back 48

to what extent two sets of data are related

Front 49

When performing correlation analysis, the closer a value is to zero, the

Back 49

less relationship there is