The difference between sex ratio and dependency ratio is given below:

Sex ratio | Dependency ratio | ||

The sex ratio, generally, denotes the number of males per 100 females. | The result which comes after dividing the population of 0-14 and 60 years and above by the population of 15-59 years age group and multiplied by 100 is called dependency ratio. | ||

Sex ratio =Total number of males × 100 / Total number of females | Dependency ratio=Number of dependence × 100 / Active population | ||

It is used to find out the ratio of male and female. | It is used to find out the ratio of active and dependent population. | ||

Sex ratio increases due to preference to son. | It increases due to increasing health status and facilities. |

Population size | Population growth rate |

Population size means the number of person s in population | Population growth rate means the joint sum of natural growth rate of population and the net migration. |

Population size is measured in number. | Population growth rate is measured in percentage. |

Midyear population (P) =4, 00,000

Birth (B) =25,000

Death (D) = 4,500

Immigration (I)=4000

Emigrants (E) =1098

According to the formula,

Net Migration rate(NMR) = ( (I-E) × 1000 ) / P

= ((4000-1098) × 1000) / 4,00,000

= (2092) / 400

= 7.25 Per thousand

Gross migration Rate(GMR) = ((I+E) × 1000 ) / P

= ((4000+1098) × 1000) / 4,00,000

= 5098 / 400

= 12.74

GMR =12.74 per thousand

Rate of Natural Increase:

= ((CBR-CDR) × 100) /1000

First of all let's calculate CBR & CDR

CBR = B × 1000 / P

= 25000 × 1000 / 4,00,000

=250 / 4

= 62.5

CDR= D × 100 / P

= 4500 × 1000 / 400000

= 45 / 4

= 11.25

CBR =62.5 per thousand CDR= 11.25 per thousand

Now,

We know that

RNI =((CBR-CDR) × 100) / 1000

=(62.5-11.25) × 100) / 1000

= -5.12 %

Rate of natural increase -5.12 %

Population Growth Rate

= (CBR-CDR+NMR) × 100 / 1000

= 58.5 / 10

= 5.85 %

Rate of population growth = 5.85 %

Population Doubling times

= 70 / Annual growth rate

=70 / 5.85

= 11.96

Population doubling time = 11.95 %

Crude Birth rate(CBR)= 20.5

Crude death rate(CDR)= 12.6

Net migration rate (NMR)= 8

Rate of natural increase (RNI)= ?

Population growth rate (PGR)= ?

We know,

RNI = (CBR-CDR)/1000*100

= (20.5-12.6)/1000*100

=. 79

Again PGR = (CBR-NMR)/1000 *100

=20.5-12.6+8/1000*100

=1.59%

Therefore, the RNI for the country's population is. 79% and PGR is 1.59% per annum.