a. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.75. You would like to be 96% confident that your esimate is within 4% of the true population proportion. How large of a sample size is required? b. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 87%. You would like to be 95% confident that your estimate is within 2% of the true population proportion. How large of a sample size is required? c. You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=39.3σ=39.3. You would like to be 98% confident that your estimate is within 2 of the true population mean. How large of a sample size is required?

Q: Thirty-seven percent of all Americans drink bottled water more than once a week (Natural resources…

A: Z = p^ -E[p¯]σp¯~ N(0,1)

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A: b) i) The frequency for strength observations are at least 85 is 18+30+43+24+22+14+3=154.

Q: Thirty-five percent of all Americans drink bottled water more than once a week (Natural resources…

A: Solution: 1. From the given information, p=0.35 and n=290.

Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…

A: Solution: Note: Hello! As you have posted more than 3 sub parts, we are answering the first 3…

Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

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Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

A:

Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…

A: Note: Hi there! Thank you for posting the question. Unfortunately in the sub-part(b), some required…

Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

A: Given: Population proportion (p) = 0.26 Confidence level = 95% Margin of error (E) = 2.5% = 0.025…

Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

A: The population proportion is 76%; p=0.76 Margin of error is 2.5%; Margin of error=0.025…

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A: Givenx=19n=308p^=19308=0.0617α=0.05

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Q: Please answer B, D and E:

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A: Given data,E = 45 - 0.04Ƶ -value at 90% confidence is Ƶc = 1.645

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A: n = Zα/2E2p(1-p)-------------Formula

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Q: hirty-seven percent of all Americans drink bottled water more than once a week (Natural resources…

A:

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A: By applying a paired 't'test, a)  sample size,n= 7 Mean (d̄) =Σd/n = 22/7 = 3.1429  standard…

Q: ou want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

A: Given: Estimated population proportion= = 0.23 Estimated standard error (E) = 0.05

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Q: #4 You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

A: Given, p^=0.65 c = 99% E = 5% = 0.05 q^=1-p^=1-0.65=0.35

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Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…

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Q: population proportion is approximately p = 0.63. You would like to be 98% confident that your…

A: From provided information; p=0.63 Margin of error (M.E) = 1.5% i.e. 0.015 Confidence level is 98%,…

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A: Solution: Given: Confidence level: C =  0.95 Margin of error: E  = 5% = 0.05 There is no preliminary…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.