Que.1
Here n = 231. and p = 0.91
np0 (1-p0) = 231 * 0.91 * 0.09 = 18.9
Because np0 (1-p0) = 18.9 is > 10, the sample size is less than 5% of the population size and the sample can be reasonably assumed to be random, the requirements for testing the hypothesis are satisfied.
Hypothesis:
Here
Test statistic,
p-value = P(z > 0.87) = 1-P(z < 0.87) = 0.192
Since p-value > , do not reject the null hypothesis and conclude that there is not sufficient evidence that more 91% of patients taking drug are healed within 8 weeks.
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