Stephenie Espinoza
Rakaylah Misquez
12/05/11
Stats Project
The members in our group are Rakaylah and Stephenie. We decided to choose our topic because we can relate to the other students on campus with the high pricing of book fees. This relates to the economy because the sales tax last year was at a higher rate and dropped this year. We wanted to see whether students paid more with the higher taxes. The student surveys on statcrunch and talking to students in classes. No biases were present during our survey.
One Mean Test #1
1. H0= 250
1. H1>250
2. α=.05
3. One Mean Test
4. Reject H0 if Pvalue <.05
5. T=.840 Pvalue =.2056
Reject Ho. There is enough evidence to support H1. Claim False
We Found that on an average students paid over $250 for their text books.
Summary statistics:


Hypothesis test results:
μ : mean of Variable H_{0} : μ = 250 H_{A} : μ > 250

Proportion Test #2
1. H0:P1=P2
1. H1: P1≠P2
2. α=.05
3. Two Proportion Test
4.Reject H0 if pvalue <.05
5.Z= 0.6356 Pvalue =.0525
Failed to Reject H0. Failed to Support H1. We cannot say it’s True.
Majority of students that we surveyed paid more than $250 for their books.

Hypothesis test results:
p_{1} : proportion of successes for population 1
p_{2} : proportion of successes for population 2
p_{1}  p_{2} : difference in proportions
H_{0} : p_{1}  p_{2} = 0
H_{A} : p_{1}  p_{2} ≠ 0
Difference 
Count1 
Total1 
Count2 
Total2 
Sample Diff. 
Std. Err. 
ZStat 
Pvalue 
p_{1}  p_{2} 
10 
20 
8 
20 
0.1 
0.15732133 
0.63564175 
0.525 
Pared Difference Test #3
1. H0 : µd=0
1. H1: µd˂0
2. α= .05
3. Pared Difference Test
4. Reject Ho if Pvalue <.05
5. T= 0.463 Pvalue =.3242
Reject H0. There is enough evidence to Support H1. Claim : We cannot say true.
We found that students paid more for books this year as opposed to last year since we reject H0.
Hypothesis test results:
μ_{1}  μ_{2} : mean of the paired difference between Last Year and This Year H_{0} : μ_{1}  μ_{2} = 0 H_{A} : μ_{1}  μ_{2} < 0

Our project did not turn out the way we thought it would because students paid more for books this year even though taxes were higher last year. We were surprised that a student paid $700 for text books. If we had more time we could have asked more students how much they paid for books both last year and this year. That a lot of money is spent on purchasing text books is what we learned. We both shared equal responsibility in the surveying of students and the gathering of data.
Already a member? Sign in.