# Using the same data set and variables for your selected topic, add the following information to your analysis

This week you will begin working on Phase 2 of your course project. Using the same data set and variables for your selected topic, add the following information to your analysis:

- Discuss the importance of constructing confidence intervals for the population mean.
- What are confidence intervals?
- What is a point estimate?
- What is the best point estimate for the population mean? Explain.
- Why do we need confidence intervals?

- Find the best point estimate of the population mean.
- Construct two confidence intervals for the population mean: a
**95%**confidence interval and a**99%**confidence interval. Assume that your data is normally distributed and**the population standard deviation is unknown**.- Please show your work for the construction of these confidence intervals and be sure to format your equations to fit the appropriate form (may need editing here).

- Write a paragraph that correctly interprets the confidence intervals in context of your selected topic.
- Compare and contrast your findings for the 95% and 99% confidence intervals.
- Did you notice any changes in your interval estimate? Explain.
- What conclusion(s) can be drawn about your interval estimates when the confidence level is increased? Explain.

**Be sure to number your responses to these questions using the same numbers as above for your sections.**** **