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A random sample of size n₁ = 23, taken from a normal population with a standard deviation 01 = 6, has a mean x₁ = 89. A second random sample of size n₂ = 39, taken from a different normal population with a standard deviation 6₂ = 4, has a mean x₂ = Find a 96% confidence interval for μ₁-₂. = 31. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The confidence interval is

A random sample of size n₁ = 23, taken from a normal population with a standard deviation 01 = 6, has a mean x₁ = 89. A second random sample of size n₂ = 39, taken from a different normal population with a standard deviation 6₂ = 4, has a mean x₂ = Find a 96% confidence interval for μ₁-₂. = 31. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The confidence interval is

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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A random sample of size n₁ = 23, taken from a normal population with a standard deviation o₁ = 6, has a mean x₁ = 89. A second random sample of size n₂ = 39, taken from a different normal population with a standard deviation ₂ = 4, has a mean x₂ = 31. Find a 96% confidence interval for μ₁ −μ₂. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The confidence interval is <H₁ - H₂<· (Round to one decimal place as needed.)
Transcribed Image Text:A random sample of size n₁ = 23, taken from a normal population with a standard deviation o₁ = 6, has a mean x₁ = 89. A second random sample of size n₂ = 39, taken from a different normal population with a standard deviation ₂ = 4, has a mean x₂ = 31. Find a 96% confidence interval for μ₁ −μ₂. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The confidence interval is <H₁ - H₂<· (Round to one decimal place as needed.)
A graduate student wanted to estimate the average time spent studying among graduate students at her school. She randomly sampled graduate students from her school and obtained a 99% confidence interval of (17,25) hours/week. Which of the following would be true if the level of confidence was lowered to 95%? Choose the correct answer below. OA. The width of the confidence interval would be smaller. B. The width of the confidence interval would be larger. C. The width of the confidence interval would remain the same. D. More information is needed to determine what would happen to the width of the confidence interval.
Transcribed Image Text:A graduate student wanted to estimate the average time spent studying among graduate students at her school. She randomly sampled graduate students from her school and obtained a 99% confidence interval of (17,25) hours/week. Which of the following would be true if the level of confidence was lowered to 95%? Choose the correct answer below. OA. The width of the confidence interval would be smaller. B. The width of the confidence interval would be larger. C. The width of the confidence interval would remain the same. D. More information is needed to determine what would happen to the width of the confidence interval.
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