Question

solve all please

zooM + Name: CCSF Introductory Statistics Econ. 5 Chapter 8 Practice Assignment Part 2 Section: 001 002 003 501 The actual proportion of voters who plan to vote for a particular proposition in the next election is 70%, but Joe does not know this. Joe has been hired by the election campaign to conduct a sample survey to estimate the proportion of voters who will vote for the proposition. Joe decides to take a random sample of size 121 from all eligible voters. Give the expected value of ?. Note that you do not have enough information to calculate the actual value of p., but you can specify E(p) 1. 2. Calculate ?p , the standard error of the proportion, also known as the standard deviation of p. Round your answer to 3 decimal places. 3. Draw a picture of the sampling distribution of p. Label the expected value and the standard error (the standard deviation of the sampling distribution). 4. Verify that this sampling distribution meets the two conditions to have the shape that it has 5. What is the probability that Joe's sample proportion will be within+.03 of the actual population proportion? Extra Credit 6. If Joe needs to be 95% confident that his sample proportion is within .03 of the actual population proportion, what size sample would he need to take? (Use the back of the sheet to do your calculations and then write the final answer here.)

Answer 1

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