1st class survey group5

8/14/2019 1st Class Survey Group5

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The Use Of StatisticsThe Use Of Statistics


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There Are Two Branches OfThere Are Two Branches Of

StatisticsStatistics

Descriptive statistics refers to theDescriptive statistics refers to the

methods for SUMMERAZINGmethods for SUMMERAZING

information so that the informationinformation so that the informationis more useful or can be obtainedis more useful or can be obtained

communicative or effectivecommunicative or effective


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4 Examples Of DISCRIPTIVE4 Examples Of DISCRIPTIVE

Statistic:Statistic:

FRENQUECY TableFRENQUECY TablePercent DistributionPercent Distribution

Bar GraphBar Graph

Pie ChartPie Chart


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Inferential StatisticsInferential Statistics

Refers to the procedure used toRefers to the procedure used to

make GENERALIZATIION from amake GENERALIZATIION from a

sample to the larger population fromsample to the larger population from

which the sample was drawnwhich the sample was drawn

There are two DIFFENT types ofThere are two DIFFENT types of

MESUREMENTSMESUREMENTS


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Two Types Of Measurements:Two Types Of Measurements:

Measure of centralMeasure of central

tendency whichtendency which

gives usgives us

information aboutinformation aboutthe center of thethe center of the

way data isway data is

distributeddistributed

MeanMean

ModeMode

MedianMedian

Measurement ofMeasurement of

dispersiondispersion


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Sample QuestionsSample Questions

How many people in your family,How many people in your family,

other than you, have attendedother than you, have attended

college?college?

How many people in your familyHow many people in your family

have graduated from college?have graduated from college?

What is your grade point averageWhat is your grade point average

(G.P.A)?(G.P.A)?

Do you have a part time or full timeDo you have a part time or full time

or no job?or no job?


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How Many People in Your FamilyHow Many People in Your Family

Graduated From College ?Graduated From College ?

DescriptiveDescriptive

statisticsstatistics

Sample numbers:Sample numbers:

0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,1,1,

1,1,1,2,2,2,2,2,2,3,1,1,1,2,2,2,2,2,2,3,

3,3,4,63,3,4,6

Frequency tableFrequency table

Bar graphBar graph

Pie chartPie chart


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Frequency TableFrequency Table

4.2%1/6

4.2%1/4

8.3%2//3

25%6///// /2

20.8%5/////1

37.5%9///// ////0

PercentFrequency

TallyCategory


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01234

567

89

0 1 2 3 4 6

.

.

.

.

.

.

.

..

.


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Pie ChartPie Chart

37.5

20.825

8.3

4.2

4.2


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Do You Have a Part Time orDo You Have a Part Time or

Full Time or No Job?Full Time or No Job?


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Do You Have A Part Time FullDo You Have A Part Time Full

Time or No Job?Time or No Job?

40.74%11///// ///// /Full timejob

37.04%10///// /////Part timejob

22.22%6///// /No job

percentFrequencyTallyCategories


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Do You Have A Part Time orDo You Have A Part Time or

Full Time or No Job?Full Time or No Job?

0.00%

5.00%10.00%

15.00%

20.00%

25.00%

30.00%

35.00%

40.00%

45.00%

No Job

Part time job

Full time job


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Bar GraphBar Graph

No Job

Part Time Job

Full Time Jo

Slice 4


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7.72//5

3.81/4

11.53///3

34.69///// ////234.69///// ////1

7.72//0

PercentFrequencyTallyCategory


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Bar GraphBar Graph

0.00%

5.00%

10.00%

15.00%

20.00%

25.00%

30.00%

35.00%

0 1 2 3 4 5

3-D Column 1

3-D Column 2

3-D Column 3


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01

2

3

4

5

Bar Graph


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MeanMean

MedianMedian

ModeMode

RangeRange

Sample numbersSample numbers

0,0,1,1,1,1,1,1,1,1,0,0,1,1,1,1,1,1,1,1,

1,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,3,3,3,4,5,5.3,3,3,4,5,5.


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Mean= 68/26=2.62Mean= 68/26=2.62

Median= 2+2/2=4/2=2Median= 2+2/2=4/2=2

Mode = 1,2Mode = 1,2Range =0+5/2= 2Range =0+5/2= 2

(Xi X)^2Xi XXi


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(-1.6)^2=2.561-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-1.6)^2=2.56

1-2.61

(-2.6)

^2=6.76

0-2.60

(-2.6)^2=6.76

0-2.60

(Xi X)^2Xi XXi


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(-.4)^2=.163-2.63

(-.4)^2=.163-2.63

(-.4)^2=.163-2.63

(-.6)^2=.362-2.62

(-.6)^2=.362-2.62

(-.6)^2=.362-2.62

(-.6)^2=.362-2.62

(-.6)^2=.362-2.62

(-.6)^2=.362-2.62

(-.6)^2=.362-2.62(-.6)^2=.362-2.62

(-.6 )^2=.362-2.62

(Xi-X)^2Xi-XXi


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(2.4)^2=5.765-2.65

(2.4)^2=5.764-2.65

(1.4)^2=1.964-2.64

(Xi-X)^2Xi-XXi


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What Is Your Grade PointWhat Is Your Grade Point

Average?Average?

ExcellentExcellent

GoodGood

AverageAveragePoorPoor


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What Is Your Grade PointWhat Is Your Grade Point

Average?Average?RawRaw

data:2.1,2.1,2.4,data:2.1,2.1,2.4,

2.4,2.5,2.5,2.6,2.7,2.4,2.5,2.5,2.6,2.7,

2.7,2.7,2.7,2.8,2.8,2.7,2.7,2.7,2.8,2.8,2.9,3.0,3.0,3.1,3.1,2.9,3.0,3.0,3.1,3.1,

3.2,3.3,3.5,3.5,3.6,3.2,3.3,3.5,3.5,3.6,

3.8,4.03.8,4.0

DescriptiveDescriptive

statisticsstatistics

Inferential statisticsInferential statistics


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8%2//2.4-1.5

72%18///// ////////// ///

3.49-2.5

20%5/////4.0-3.5

PercentFrequencyTallyCategories


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Bar GraphBar Graph

0%

10%

20%

30%

40%

50%

60%

70%

80%

4.0-3.5 3.49-2.5 2.4-1.5

3-D Column 1

.

.


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Pie ChartPie Chart

4.0-3.5

3.49-2.5

2.4-1.5

Slice 4


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Mean =Mean =Xi/n=2.9Xi/n=2.9

Mode= 2.8Mode= 2.8

Median=2.7Median=2.7

(Xi X)^2Xi XXi


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(-.1)^2=.12.8-2.92.8

(-.2)^2=.42.7-2.92.7

(-.2)^2=.42.7-2.92.7(-.2)^2=.42.7-2.92.7

(-.2)^2=.42.7-2.92.7

(-.3)^2=.92.6-2.92.6

(-.4)^2=.162.5-2.92.5

(-.4)^2=.162.5-2.92.5

(-.5)^2=.252.4-2.92.4

(-.5)^2=.252.4-2.92.4

(-.8)^2=.642.1-2.92.1

(-.8)^2=.642.1-2.92.1

(Xi-X) 2Xi-XXi

( 1)^2 12 1 2 82 8


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(.3)^2=.93.2-2.93.2

(.9)^2=.813.8-2.93.8

(1.1)^2=1.214.0-2.94.0

(1)^2=13.6-2.93.6

(.6)^2=.363.5-2.93.5

(.6)^2=.363.5-2.93.5

(.4)^2=.163.3-2.93.3

(.2)^2=.43.1-2.93.1

(.2)^2=.43.1-2.93.1

(.1)^2=.13.0-2.93.0

(.1)^2=.13.0-2.93.0

(0)^2=02.1-2.92.9

(-.1)^2=.12.1-2.82.8


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1st class survey group5

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