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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.

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How many seniors are on march towards graduation

How Many Seniors Are On March Towards Graduation?

Miriam Cordova

Marcela Lopez

Angelly Baltazar

Period:3

March 19,2013


California standards
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
Hypothesis

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


Data collection
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


How many seniors are on march towards graduation
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
Statistics

  • From our survey, senior sample that are on march to graduation has the sample proportion is 69/102=67.65%


Confidence interval
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 Testing

Hypothesis

Test Statistics

Conclusion

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


Error analysis
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
Conclusion

  • •We are 95% confident that the population proportion of the seniors on march to graduation is between (58.57%-76.73%).