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WHAT IS CONFIDENCE INTERVAL FOR μ WHEN σ IS KNOWN?
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Let the standard deviation of the population in Example 8.1 be 0.05 instead of 0.03. Compute the 95% confidence interval based on the same sample information.
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Explain The Width of a Confidence Interval?
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Instead of 25 observations, let the sample in Example 8.1 be based on 16 observations. Compute the 95% confidence interval using the same sample mean of 1.02 pounds and the same population standard deviation of 0.03.
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Compute the 99%, instead of the 95%, confidence interval based on the information?
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Table lists a portion of the weights (in grams) for a sample of 80 hockey pucks. Construct the 90% confidence interval for the population mean weight assuming that the population standard deviation is 7.5 grams.
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What is the t DISTRIBUTION?
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Compute t_(α,df)for α = 0.025 using 2, 5, and 50 degrees of freedom.
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