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hypothesis testing question

Mrs da Silva is running for president. She claims to have 60% of the population supporting her.

She is suspected of overestimating her support and a random sample of 20 people are asked whom they support. Only nine day mrs da Silva.

Test, at the 5% significance level, the hypothesis that she has overestimated her support.

By the way you may need to look at Cumulative binomial probability tables

Reply 1

plainsoveralls

The null hypothesis is that p=0.6 and the alternate is that p<0.6
Using n=20 and p=0.6, find the probability that x is less than or equal to nine. If that probability is less than 0.05 then the null hypothesis can be rejected.

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