Question

A recent study from China concluded that people with type O blood may have a lower...

A recent study from China concluded that people with type O blood may have a lower risk of contracting the new coronavirus than people with other blood types. About 41% of the world population has type O blood. A random sample of 750 people from one country is selected, of whom 375 have type O blood. Does the data suggest that the population proportion of type O blood in a selected country is different than the worldwide proportion? Conduct a statistical test with the Type I error 2%.

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Answer #1

Given

P = 0.41

n=750

p = 375/750

=0.5

H0: P= 0.41

H0: P 0.41

= 0.02

Test statistics

  

The critical value of Z = 2.33

p-value = 0.00001

Decision: p-value( 0.00001) < 0,02

Reject H0

Conclusion:

There is enough evidencet to conclude that the population proportion of type O blood in a selected country is different than the worldwide proportion.

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