Midterm

Question 1

The difference between the highest and lowest score

Answer 1

Range

Question 2

A grouping or category defined by a lower and upper limit

Answer 2

Class interval

Question 3

The true limit

Answer 3

Class boundaries

Question 4

Middle value or midpoint of a class interval

Best representative of class interval

Answer 4

Class mark

Question 5

Percentage distribution in every class interval

Answer 5

Relative frequency

Question 6

Number of observations belonging to a class interval

Answer 6

Class frequency

Question 7

Tabular arrangement of data by class intervals whose frequency is cumulated

Answer 7

Cumulative frequency distribution

Question 8

Sum of frequencies for each ci is less than upper class boundary

Answer 8

Less than cumf

Question 9

Sum of frequency for each ci is greater than lower class boundary

Answer 9

Greater than cumf

Question 10

Tabular arrangement of data showing proportion in percent of each frequency to the total frequency

Answer 10

Relative frequency distribution

Question 11

Formula for R

Answer 11

R=HS -LS

Question 12

Formula for i

Answer 12

i = R/ci

Question 13

Formula for class mark

Answer 13

Class mark = UL + LL / 2

Question 14

Formula for rel. freq.

Answer 14

RF = f/n x 100

Question 15

Rounding rule for i

Answer 15

Round off

Question 16

Tabular arrangement of the gathered data

Answer 16

Frequency distribution

Question 17

It is used when the values are not all equally represented

Answer 17

Weighted mean

Question 18

Formula for wgtd mean

Answer 18

Wgtd mean = wgtd freq / freq

Question 19

Is found by first adding all the scores and then dividing by the number of scores

Most sensitive and reliable

Answer 19

Mean

Question 20

Rounding rule for mean

Answer 20

Round off

Question 21

Properties of mean

Answer 21

Sum of deviations from mean = 0

Total sum of negative deviations = positive deviations

If added or multiplied to each score, mean will also multiply or add

May not exist in the distribution

All variables under investigation are computed

Mean is efficient

Mean is unique

Mean is fulcrum or balance point of distribution

Question 22

Disadvantages of mean

Answer 22

Mean can take fractional value

Mean is sensitive: strongly influenced by outliers

Question 23

Uses of mean

Answer 23

Variables are measured at the interval-ratio

Anticipate standard deviation

Question 24

Is an extremely high or an extremely low data value when compared with the rest of the data values

Answer 24

Outlier

Question 25

Point on the scale of measurement that divides a series of ranked observations into halves

Answer 25

Median

Question 26

When n is an odd number

Answer 26

Ex. N=7 | Md = 7/2 = 3.5= 4th (rounded up) = 4th score

Question 27

When N is an even number

Answer 27

Ex. N=6 | Md= 6/2=3rd + 4th/2

Question 28

Properties of median

Answer 28

Positional measure Most representative average Most reliable in open-ended distribution Unique Exists in any distribution

Question 29

Uses of median

Answer 29

Variables are measured in ordinal or interval-ratio level when distribution is skewed More stable measure of central tendency is needed

Question 30

Point on the measurement scale with the maximum frequency

Answer 30

Mode

Question 31

40,45,46,47,47,48,49,50 Mo=

Answer 31

47

Question 32

40,45,47,48,49,50

Answer 32

No mode. | It is wrong to say 0

Question 33

40,40,42,42,44,44,45,47 Mo=

Answer 33

40,42 | Bimodal

Question 34

Properties of mode

Answer 34

Used for nominal data Center of concentration Does not always exist Not always unique Does not take into consideration all values

Question 35

Uses of mode

Answer 35

Quickest estimate of central value Report most common score

Question 36

Properties of range

Answer 36

Simplest measure of dispersion Easiest to understand Rough estimate of variability

Question 37

Average of the squares of the distance of each value from mean

Answer 37

Variance

Question 38

Square root of variance

Answer 38

Deviation

Question 39

Used of variance and deviation

Answer 39

Determine spread of data Consistency of variable Used inferential statistics Determine number of values that fall within specified intervals Minimum value of 0

Question 40

Divide distribution into 4 parts

Answer 40

Quartiles

Question 41

How many quartiles

Answer 41

3

Question 42

Divide distribution into 10 equal parts

Answer 42

Decile

Question 43

Values that divide distribution into 100 parts

Answer 43

Percentiles

Question 44

Scores above mean | Scores below mean

Answer 44

+ deviation | - deviation