What is the most suitable null and alternative hypothesis for following problem?
It is believed that the average level of Prothrombin in a normal population s 20 mg/100 ml of blood plasma with a standard deviation of 4 mg /100 ml. To verify this, a sample is taken from 40 individuals in whom the average is 18.5 mg/100 ml.
My answer is
H0:average level of prothombrin in a normal population = 20mg/100ml
H1:average level of prothombrin in a normal population != 20mg/100ml
but in the answer sheet they have stated as follows
H0:sample is not taken from 40 individuals in whom the average is 18.5 mg/100 ml.
H1:sample is taken from 40 individuals in whom the average is 18.5 mg/100 ml.
is my answer incorrect?
How do we determine the exact null and alternative hypothesis for given problem?
[self-study]
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