Revised Analysis of Covid-19 of USA and UK

Table showing with Covid-19 confirmed cases  with deaths in USA and UK as on July 8, 2020

		Confirmed		Deaths
USA		2923432		129963
UK		286353		44391
	Total	3209785		174354

Source: WHO

Let P₁ and P₂ be the proportion of deaths to confirmed cases of Covid-19.

We set Null Hypothesis H₀: P₁ = P₂                                                                                                                                                                             Then the Alternative Hypothesis is H_1:: P₁ # P₂      

We have, p = (n₁p₁+n₂p₂)/(n₁+n₂) and S.E. of (p₁-p₂) = √(pq)(1/n₁+1/n₂)

                                                Z = |p₁-p₂|/S.E. of (p₁-p₂)  

n1 =	n1=	2923432	p1 =	0.044456	n2 =	286353	p2 =	0.155022
	a1=	129963			a2=	44391
1/n1=	3.42064E-07		p=	0.054	q =	0.946
1/n2=	3.49219E-06	|p1-p2|=	0.11056632
1/n1+1/n2=	3.83426E-06	p*q =	0.05136892	(1/n1+1/n2) =			3.83426E-06
		=	0.000444				=
		S.E. of (p1-p2) =		0.000444
			|z|=	249.13	=

|z| = 2.58 at 1% level of significance.  We reject the Null Hypothesis H₀ as  obs|z| = 249.13 and conclude that proportion of deaths due to Covid-19 is significantly higher in U.K. than in USA.                                                                                                                                                        

Confirmed and Deaths in Worldwide and USA by COVID 19 as on May 26, 2020.

		Confirmed		Deaths
World		5509398		347206
USA		1675920		99004
	Total	7185318		446210

Source:- www.live population.com

               John Hopkins/NBC                                                                                          Let P₁ and P₂ be the proportions of populations died to confirmed cases of COVID-19 in the world and USA.

We[i] set the Null Hypothesis H₀:P₁=P₂

Alternative Hypothesis H₁:P₁ # P₂

We have p = (n₁p₁+n₂p₂)/(n₁+n₂) and SE of p₁-p₂ )=  sqrt (pq)(1/n₁+1/n₂)

Z = (p1-p2)/SE of P1-P2)

Here	n1=	5509398	p1 =	0.063021	n2 =	1675920	p2 =	0.059074
	a1=	347206			a2=	99004
			p=	0.0621	q =	0.72
		p1-p2=	0.003946
		p*q =	0.044712	(1/n1+1/n2) =			7.78195E-00707
		=	0.000187				=
		S.E. of (p1-p2) =		0.000187
					=	21.16

Z = 21.6>2.58 at 1% level of significance.  Hence, we reject the Null Hypothesis H₀ and conclude that the proportion of deaths to confirmed cases of COVID-19 is significantly higher in USA than Worldwide.

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[i]