# Cristian Barrios Jacky Cortez Maria Canongo Period 2 Year (2011-2012) - PowerPoint PPT Presentation

Cristian Barrios Jacky Cortez Maria Canongo Period 2 Year (2011-2012)

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Cristian Barrios Jacky Cortez Maria Canongo Period 2 Year (2011-2012)

## Cristian Barrios Jacky Cortez Maria Canongo Period 2 Year (2011-2012)

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##### Presentation Transcript

1. Cristian Barrios Jacky Cortez Maria Canongo Period 2 Year (2011-2012)

2. California standards

3. Hypothesis • We believe that the average hours centurions spend on their phone is 3 hours.

4. Data Collection Method • We are using cluster sampling by asking only seniors. • Example: we will collect data by using the cluster method technique by asking them how many hours they spend on their phone’s per day. • Two of us asked 13 senior students, and one of us asked 14 senior students equaling a total of 40 seniors at Century High School.

5. Data • Number of hours. • 3, 2, 1, .5, .5, 2, 8, 4, 12, 1.5, 10, 6, 12, 5, 20, 1, 1, 2, 4, 13, 12, 8, 6, 12, 7, 14, 18, 8, 12, 3, 20, 14, 10, 9, 11, 10, 4, 14, 12, 12

6. Histogram

7. Statistics • From our survey, students sample mean time is 8.0125 hrs., with a sample standard deviation of 5.4272 hrs.

8. Confidence Interval

9. Hypothesis Testing • Step I Hypothesis Claim: We believe that the average hours centurions spend on their phone is 3 hours. Ho: µ= 3(claim) Ha: µ≠ > 3 • Step II Test Statistics P-value: 5.19 x 10-9 • Step III Conclusion At 5% level of significance, we failed to reject. There is enough evidence to support our claim.

10. Error Analysis • Our sample mean is 8.01 hours, and the 95% confidence level for the population mean is between 6.3 to 9.7 hours. The marginal error is about 2 hours. • •Our sample error is due to possible under-representation of the population. We might need to take more samples due to students that have phones, and those who don’t.

11. Conclusion • We hypothesized that Century seniors commute time average is 3 hrs. In our survey of 40 seniors, we found the sample mean of 8.0125 hrs., with standard deviation of 5.4272 hrs. We conclude that the population mean for the seniors students is between (6.3306,9.6944)hrs with 95% confident. We tested our initial hypothesis with 5% level of significance, and found out our hypothesis was incorrect.