How Many Seniors Are On March Towards Graduation?

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# How Many Seniors Are On March Towards Graduation? - PowerPoint PPT Presentation

How Many Seniors Are On March Towards Graduation?. Miriam Cordova Marcela Lopez Angelly Baltazar Period:3 March 19,2013 . California Standards.

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### How Many Seniors Are On March Towards Graduation?

Miriam Cordova

Marcela Lopez

Angelly Baltazar

Period:3

March 19,2013

California Standards
• 8.0 Students organize and describe distributions of data by using a number of different methods, including frequency tables, histograms, standard line and bar graphs, stem-and-leaf displays, scatter plots, and box-and-whisker plots.
• 17.0 Students determine confidence intervals for a simple random sample from a normal distribution of data and determine the sample size required for a desired margin of error.
• 18.0 Students determine the P- value for a statistic for a simple random sample from a normal distribution
Hypothesis

We believe that the average number of seniors on march towards graduation is 90%-95%.

Data Collection
• Sampling technique used, and describe briefly about the sampling process
• Example: We will collect data by using the random sampling method. We asked 102 senior students at Century
Data
• Number of students asked (seniors)
• 69 seniors said they are on march to graduation
• 33 seniors said they weren\'t on march to graduation
Statistics
• From our survey, senior sample that are on march to graduation has the sample proportion is 69/102=67.65%
Confidence Interval
• 95% Confidence Interval
• 1 prop z-interval
• (58.57% ~ 76.73%)
• We are 95% confident the population proportion of the seniors on march to graduate is between 67.65% ~ 67.65%.

### Hypothesis Testing

Hypothesis

Test Statistics

Conclusion

At 5% level of significance, we failed to reject . There is enough evidence to support our claim.

Error Analysis
• •Our sample population prop portion is 95% confidence level for the population of the senior on march to graduate is between 58.57%-76.73%.
• •Our sample error is due that we did not ask all the senior of the population. We might need to take more samples due to students absences.
Conclusion
• •We are 95% confident that the population proportion of the seniors on march to graduation is between (58.57%-76.73%).