STATISTICS

Question 1

is a single value that attempts to describe a set of data by identifying the central position within that set of data.

Answer 1

A measure of central tendency

Question 2

3 MEASURE OF CENTRAL TENDENCY

Answer 2

MEAN MEDIAN MODE

Question 3

2 KING OF MEAN!

Answer 3

SAMPLE MEAN= x̄
AND
POPULATION MEAN = μ

Question 4

BIMODAL MEANS

?

Answer 4

2 MODES

Question 5

is a dispersion of a set of data point around the mean value

Answer 5

VARIANCE

Question 6

THE SQUARE ROOT OF THE VARIANCE

Answer 6

STANDARD DEVIATION

Question 7

WHAT IS USUALLY USED WHEN COMPARING DATA

Answer 7

COEFFICIENT OF VARIATION

Question 8

VARIANCE FORMULAE

Answer 8

σ^2= nΣ(i=1) [(Xi-μ)^2/n] =POPULATION variance

s^2= nΣ(i=1) [(Xi-x̄)^2/(n-1)] =SAMPLE variance

Xi= observed/sample values
n= total number of observations/sample

Question 9

COEFFICIENT OF VARIATION FORMULA

Answer 9

population COV= σ/μ

Sample COV= s/x̄

Question 10

STANDARD DEVIATION FORMULAE

Answer 10

σ= √(σ^2) = population Standard deviation

s= √(s^2) = sample standard deviation

Question 11

characteristic of each of the 3 measure or variability

Answer 11

variance= most common in measuring data dispersion

standard deviation= most common in measuring variability for a single data set

coefficient of variabilirty= most common in comparing data

Question 12

in measuring location of data, dviding order data into hundredths will give us the _____, while dividing ordered data in quarters will give us the ____

Answer 12

percentile ranking

quartile ranking

Question 13

a number where certain percentages of scores fall below that number

Answer 13

PERCENTILE

Question 14

FORMULA FOR THE PERCENTILE OF A VALUE IN A DATA SET

Answer 14

k= (x+ .5y)/n x100

x= the number of data values counting from the bottom of the data list up to but not including the data value for which you want to find the percentile.

y=the nunber of data values equal to the data of which you want to find the percentile

n= total number of data

Question 15

how to solve of STANDARD DEVIATION IN YOUR CALCU?

Answer 15

MODE- STAT- (1-VAR) - INPT TABLE - AC

SHIFT - STAT - VAR - xσ

Question 16

FORMULA FOR FINDING THE RANKING/POSITION OF DATA IN A SET, GIVEN ITS PERCENTILE RANKING.

Answer 16

i = [k/100] (n+1)

i= position/ranking

• if (i) is non-integer, get the average of the rounded up and rounded down value in the data set.

Question 17

a group of values and/or mean that is divide a data set by quarters or group of fours

Answer 17

QUARTILE

QUARTILE IS A VALUE! unlike quarter

Question 18

differentiate the quartile with quarter.

Answer 18

quartile is a value, while quarter represent the group of data that is a fourth of the set.

• in a pizza, quarter represent the 1/4 of the whole, while quartle represent the cut/ending of the first quarter and beginning of the next quarter.

Question 19

difference between an upper quartile value and a lower quartile value.

Answer 19

INTERQUARTILE RANGE

IQR= UPPER QUARTILE- LOWER QUARTILE
IQR= 3RD QUARTILE- 1ST QUARTILE

Question 20

DIFFERENCE BETW MAXIMUM AND MINIMUM VALUES OF THE DATA SET, IT PROVIDES A BETTER UNDERSTANDING HOW VARIED A DATA SET IT.

Answer 20

RANGE