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In a random sample of 400 registered voters, 115 indicated they plan to vote for Candidate A. Chapter 8- Confidence Interval:

2. In a random sample of 400 registered voters, 115 indicated they plan to vote for Candidate A.
Chapter 8- Confidence Interval:
Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Candidate A.
From last week:

I am 95% sure that between 24.31% to 33.19% of ALL registered voters will be voting for candidate A.

Interpret the margin of error and interpret the confidence interval. Show every step and interpret your findings in details.


I am 95% sure that my sample finding (P-Bar= 28.8%) differs from proportion of All voters who will be voting for candidate A by as much as 4.44%.


Chapter 9- Test of Significance:
Using the result of this study, reporters from different news organizations had their own predictions about the outcome of the statewide election on November of next year. The LA Times reporter who covered this story predicted that candidate A will get one third of the votes.
a. Using the confidence interval method, test the claim of LA Times reporter at 10 percent level of significance. Show every step and interpret your findings in details.

b. Using the test statistics method ( Z or T test), test the claim of LA Times reporter at 5 percent level of significance. Show every step and interpret your findings in details.



c. Using the P-Value method, test the claim of LA Times reporter at 5 percent level of significance. Show every step and interpret your findings in details.


d. Interpret the P-Value for previous part.

e. The CNN reporter who covered this story, predicted that candidate A will win the election. Using the confidence interval method, test the CNN’s claim at 5 percent level of significance. Show every step and interpret your findings in details.

f. Using the test statistics method ( Z or T test), test the CNN’s claim at 5 percent level of significance. Show every step and interpret your findings in details.


g. Using the P-Value method, test the CNN’s claim at 5 percent level of significance. Show every step and interpret your findings in details

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2. In a random sample of 400 registered voters, 115 indicated they plan to vote for
Candidate A.
Chapter 8- Confidence Interval:
Determine a 95% confidence interval for the proportion of all the...

Sign up to view the full answer

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