1. Lucero Sosa Edgar Flores Period 1

2. California Standards  8.0 Student organized and describe distribution of data by using of different methods, including frequency table, histogram, standard line and bar graphs, stem-and-leaf displays, scatter plots, and box of whisker plots.  17.0 Students determine confidence interval 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 Student determine the P-value for a statistic for a simple random sample from a normal distribution

3. Hypothesis  We believe the population proportion will be 65% of juniors and seniors dislike Century’s restrooms.

4. Data Collection  Two group members will collect data by using the stratified method, a method that involves the division of population into smaller groups  We had a yes or a no answer for 100 students between juniors and seniors, during lunch.

5. Data StudentsYesNoTotal Seniors163450 Juniors173350 Total3367100

6. Statistics  Sample population is 33/100 =0.33 the totals of “Yes”.  Sample population is 67/100=0.67 the total of “No”.

7. Confidence Interval  We are 95% confident the population proportion of students at Century dislike the restrooms is between 24% and 42%.

8. Hypothesis Testing Hypothesis Test Statistics 1-prop z- test P-Value=1<.05 Conclusion At 5% level of significance, we failed to reject Po. There is enough evidence to support our claim.

9. Error Analysis  Our sample proportion is 33% said yes, and the 95% confidence level for the population proportion is between 24% and 42%.  Sample error Our survey could of been a little better if we asked more people. And if we could of teamed up with smarter people.

10. Conclusion  We hypothesized that 65% Century’s Seniors and Juniors students don’t like Century’s restroom. On our survey of 100 students, we found that.33% seniors and juniors do like Century's restroom and 67% don’t like Century’s restroom. Our hypothesis was almost correct.