Use the sample information x= 36, o = 4, n= 13 to calculate the following confidence intervals for µ assuming the sample is from normal population. (a) 90 percent confidence. (Round your answers to 4 decimal places.) The 90% confidence interval is from to

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### Confidence Intervals Calculation

#### Instructions:
Use the sample information \( \bar{x} = 36 \), \( \sigma = 4 \), \( n = 13 \) to calculate the following confidence intervals for \( \mu \) 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.**
- ☑ The interval gets narrower as the confidence level increases. (Note: This statement seems contradictory. Higher confidence levels generally result in wider intervals. Ensure to verify and adjust your understanding.)

---

### Explanation:
This exercise demonstrates the calculation of confidence intervals based on sample data from a normal distribution. Using the provided sample mean (\(\bar{x}\)), population standard deviation (\(\sigma\)), and sample size (\(n\)), students are to compute the confidence intervals at varying levels of confidence (90%, 95%, and 99%). This not only applies statistical formulas but also helps in understanding how confidence levels impact interval width.
Transcribed Image Text:### Confidence Intervals Calculation #### Instructions: Use the sample information \( \bar{x} = 36 \), \( \sigma = 4 \), \( n = 13 \) to calculate the following confidence intervals for \( \mu \) 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.** - ☑ The interval gets narrower as the confidence level increases. (Note: This statement seems contradictory. Higher confidence levels generally result in wider intervals. Ensure to verify and adjust your understanding.) --- ### Explanation: This exercise demonstrates the calculation of confidence intervals based on sample data from a normal distribution. Using the provided sample mean (\(\bar{x}\)), population standard deviation (\(\sigma\)), and sample size (\(n\)), students are to compute the confidence intervals at varying levels of confidence (90%, 95%, and 99%). This not only applies statistical formulas but also helps in understanding how confidence levels impact interval width.
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