Texts: Predicting the Population Proportion or Population Mean
Collect data, at least 15 metric values, and find the confidence interval for the population mean. Or... find the confidence interval for a population proportion, where you will need at least 20 responses to a survey question you came up with. **Again: if you are finding the confidence interval for the population proportion, you will have to ask at least 20 people their response to the poll question!
Yes – you can use the data from past projects!
Develop a 78% confidence interval and a 94% confidence interval for the population proportion or population mean.
Note 1: You will work with either the mean or the proportion. Not both. Not blended.
Note 2: If you are finding the confidence interval for the population proportion, attach the question, first names, and response of subjects. In a nutshell, the idea is to show that you understand confidence intervals and can interpret your results. The checklist below provides details.
Here is a Project 3 Checklist:
3□ Title
2□ Your Name(s)
5□ Area of Interest and Why the Information is of Interest to You.
5□ Data Type: Qualitative or Quantitative (which of the two is the type for the data you are using?).
5□ Data / Question (include source for mean / question, first names, and response of your subjects for proportion)
10□ State Either the Sample Mean or P-hat (state result and show formula; work not required)
10□ State Either the Sample Standard Deviation or Q-hat (state result and show formula; work not required)
5□ To Find the Confidence Intervals, Do You Use a Z Statistic or T Statistic? Why?
20□ Margin of Error for 78% Confidence (state result and show formula; work not required)
The 78% Confidence Interval
20□ Margin of Error for 94% Confidence (state result and show formula; work not required)
The 94% Confidence Interval
15□ Summary Statements (Statement interpreting both confidence intervals. Add what you discovered in doing this project, ... if anything stood out.)
Example Topics: Determine the mean cost of a car that you like or salary for the career you seek. Determine the percentage of students who do prefer Algebra over Statistics J or the percent of people who like dogs over cats.