a. Explanation Given: Sample size ( n ) = 50 Standard deviation ( σ ) = 26 Confidence level = 90 % Formula used: The formula for margin of error is: Margin of error = z α 2 × σ n Where, z α 2 is the critical value b. To determine To explain: Whether the margin of error would be larger or smaller, if the sample size is 40.

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ISBN: 9780077836351

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Publisher: McGraw Hill

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Chapter 8.1, Problem 34E

To determine

To find: The margin of error for a 90% confidence interval for μ .

To determine

To explain: Whether the margin of error would be larger or smaller, if the sample size is 40.

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Chapter 8.1, Problem 33E

Chapter 8.1, Problem 35E

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Elementary Statistics (Text Only)

Ch. 8.1 - In Exercises 25-28, find the critical value z/2...Ch. 8.1 - Prob. 28E Ch. 8.1 - In Exercises 29-32, find the levels of the...Ch. 8.1 - In Exercises 29-32, find the levels of the...Ch. 8.1 - In Exercises 29-32, find the levels of the...Ch. 8.1 - In Exercises 29-32, find the levels of the...Ch. 8.1 - A sample of size n=49 is drawn from a population...Ch. 8.1 - Prob. 34E Ch. 8.1 - A sample of size n=32 is drawn from a population...Ch. 8.1 - A sample of size n=64 is drawn from a population...Ch. 8.1 - A sample of sue n=10 is drawn from a normal...Ch. 8.1 - Prob. 38E Ch. 8.1 - A population has standard deviation 21.3. How...Ch. 8.1 - Prob. 40E Ch. 8.1 - A population has standard deviation =12.7 How...Ch. 8.1 - Prob. 42E Ch. 8.1 - SAT scores: A college admissions officer takes a...Ch. 8.1 - Prob. 44E Ch. 8.1 - Babies: According to the National Health...Ch. 8.1 - Watch your cholesterol: A sample of 314 patients...Ch. 8.1 - How smart is your phone? 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Assume the...Ch. 8 - Prob. 10RE Ch. 8 - Prob. 11RE Ch. 8 - Sleep time: In a sample of 87 young adults, the...Ch. 8 - Leaking tanks: Leakage from underground fuel tanks...Ch. 8 - Prob. 14RE Ch. 8 - Prob. 15RE Ch. 8 - Prob. 1WAI Ch. 8 - What factors can you think of that may affect the...Ch. 8 - Prob. 3WAI Ch. 8 - Prob. 4WAI Ch. 8 - Prob. 5WAI Ch. 8 - When constructing a confidence interval for , how...Ch. 8 - Prob. 7WAI Ch. 8 - Prob. 1CS Ch. 8 - Prob. 2CS Ch. 8 - Prob. 3CS Ch. 8 - Prob. 4CS Ch. 8 - Prob. 5CS

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The margin of error for a 90 % confidence interval for μ .

Solution Summary: The author explains that the margin of error for a 90% confidence interval for mu is 6.049.