Make sure you show or print out all your work. If you just give me answers you w

Question

Make sure you show or print out all your work. If you just give me answers you will not get full credit.

1. In a survey of 2303 U.S. adults, 734 believe in UFOs.

a. Construct a 90% confidence interval for the population proportion of U.S. adults who believe in UFOs.

b. If you wanted a margin of error of .01 what sample size would you have to employ using the most conservative estimate

c. If you had a strong hunch that 40% (a guess) of the people believed in UFOs what sample size would be needed to achieve that same .01 margin of error.

2. Dog Ownership. A humane society claims that less than 35% of U.S. households own a dog. In a random sample of 400 U.S. households, 156 say they own a dog.

At a 10% signifance level, is there enough evidence to support the society’s claim?

a. State the null and the alternative hypothesis.

b. What are the results of the test using the critical value method? Should we believe the humane society?

c. Do a P test.

d. Are the results consistent part b?

e. Print the plot.

Explanation / Answer

1) 90% confidence interval for proportion

(0.3041, 0.3359)

b) N = 9604

2) b) z = 1.66

P value = 0.09691

Result is not significant

I solved this example complete but due to site problem image not uploaded

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