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Lucero Sosa Edgar Flores Period 1

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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

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

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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.

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Data StudentsYesNoTotal Seniors163450 Juniors173350 Total3367100

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

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

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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.

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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.

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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.

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