## (Solution Document) You bet a friend that 90% or more of the students taking the Bio 101 class know their blood type.

You bet a friend that 90% or more of the students taking the Bio 101 class know their blood type. You contact a simple random sample of 80 students taking Bio 101 this term to test the hypothesis and find that 77 students know their blood type.

a)    Check the sample size and explain why you cannot use the Z-method for the test?

b)  Use the Binomial method, compute the pvalue for the test and conclude. Hint: The p value is the probability of getting as least the same or more people than in the sample (77 students) know their blood type. If the pvlaue is less than 0.05, Ho is rejected.

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This question was answered on: Dec 08, 2020

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