ARE 60% OF SENIORS OUT OF UNIFORM? B Y : K E A R S T I N , M E G , - - PowerPoint PPT Presentation

ARE 60% OF SENIORS OUT OF UNIFORM?

B Y : K E A R S T I N , M E G , A N D C H A R L OT T E

ABOUT OUR SAMPLE

• The sample that we took was a systematic sample
• We stood in different common areas and we recorded how every fourth senior that walked by

was in or out of uniform.

• This was a representative sample because standing in different common areas allowed us to

sample a variety of people.

• By sampling every fourth person, our data was more randomized
• We chose to sample 34 students because in the four days that we sampled people, in total, the

seniors made 340 appearances and 34 is 10% of the seniors in the time span of four days.

PROBLEM: ARE 60% OF SENIORS OUT OF UNIFORM? NULL HYPOTHESIS: 60% OF SENIORS ARE OUT OF UNIFORM.

• Null Hypothesis: P0= 0.60
• Alternative Hypothesis: PA≠ 0.60

DATA

• Twenty-five out of the thirty-four seniors that we sampled were out of uniform (73.5%)
• Nine out of the thirty-four seniors that we sampled were in uniform (26.5%)
• The percentage of seniors that were out of uniform was 15.5% more than we had predicted it

would be

• The percentage of seniors out of uniform was 14.5% less than we had expected it would be.
• 47% more people were out of uniform than in uniform.

PROBLEM: ARE 60% OF SENIORS OUT OF UNIFORM? NULL HYPOTHESIS: 60% OF SENIORS ARE OUT OF UNIFORM.

• Null Hypothesis: P0= 0.60
• Alternative Hypothesis: PA≠ 0.60
• X= 25
• N=34
• P-Value= 0.107
• P-Value Interpretation: If the true proportion of people passing the test is 60%, then the

probability of getting this kind of sample is 10.7%.

CALCULATIONS

CONCLUSION

We fail to reject the null hypothesis because the P-Value was

• ver 5%. We don’t have enough

evidence to prove that the null hypothesis is incorrect.