Use the sample information x¯x¯ = 38, σ = 4, n = 11 to calculate the following confidence intervals for μ assuming the sample is from a normal population. (a) 90 percent confidence. (Round your answers to 4 decimal places.) The 90% confidence interval is from ? to ? (b) 95 percent confidence. (Round your answers to 4 decimal places.) The 95% confidence interval is from ? to ? (c) 99 percent confidence. (Round your answers to 4 decimal places.) The 99% confidence interval is from ? to ?
Use the sample information
x¯x¯
= 38, σ = 4, n = 11 to calculate the following confidence intervals for μ assuming the sample is from a normal population.
(a) 90 percent confidence. (Round your answers to 4 decimal places.)
The 90% confidence interval is from
? to ?
(b) 95 percent confidence. (Round your answers to 4 decimal places.)
The 95% confidence interval is from
? to ?
(c) 99 percent confidence. (Round your answers to 4 decimal places.)
The 99% confidence interval is from
? to ?
(d) Describe how the intervals change as you increase the confidence level.
multiple choice
- The interval gets narrower as the confidence level increases.
- The interval gets wider as the confidence level decreases.
- The interval gets wider as the confidence level increases.
The interval stays the same as the confidence level increases.
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