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5) A poll of 1,200 adult Americans reveals that 570 of the voters surveyed prefer the...

5) A poll of 1,200 adult Americans reveals that 570 of the voters surveyed prefer the democratic candidate for the presidency. At the .05 level of significance, do the data provide sufficent evidence that the percentage of all voters who prefer the Democrat is less than 50%?

a) Identify the null hypothesis and alternative hypothesis.

b) Find the test statistic, the P-value, and draw the graph.

c) Conclusion about the null hypothesis. Reject the H0 or do not reject the H0? why?

d) Final conclusion that addresses original claim.

e) Construct a 90% confidence interval for the true proportion of all voters who prefer the Democrat.

Math   Statistics-And-Probability   
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Answer #1

We are 90% confident that population proportion lie in the internal ( 0.451,0.499)

We accept null hypothesis

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