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Hi. I have a discussion for class this week. Here is what we had to do:Think of

a problem that you may be interested in that deals with a comparison of two population means. Propose either a confidence interval or a hypothesis test question that compares these two means. Gather appropriate data and post your problem (without a solution) in the discussion topic.


Here is my problem:


Hi Class!

We are having an unusually hot day here in Philadelphia so it got me wondering if temperatures are hotter now than they were in 2000. I chose the week of 9/25/2000 and compared it to the week of 9/25/2019. I am comparing the mean temperature for the 5 days. I will use a 2 sample t-stat for means w,ith a significance level of .05. 

Data taken from: https://www.wunderground.com/history/weekly/us/pa/philadelphia/KPHL/date/

September 2000 sample high temperatures: 77,60,55,68,69,62 and 67

September 2019 sample high temperatures: 89,91,77,80,83,79,84

I used a t-stat since the samplings are random, independent and from different years, the population is larger than the sample, and after using statcrunch no outliers. 

I will post answer later. 

Thank you!


I am using stat crunch and I think I am fouling myself up with the level of significance. Am I calculating this right? Am I rejecting?

I think september 2019 hotter than 2000

see screen shot attached

Screenshot 2019-10-02 18.44.19.png

Screenshot 2019-10-02 18.44.19.png

Southern New Hampshi
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Two sample T hypothesis test:
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H1 : Mean of vari
H2 : Mean of var2
H1 - H2 : Difference between two means
Ho : H1 - H2 = 0
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HA : H1 - H2 <0
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Hypothesis test results:
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T-Stat
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H1 - H2
-18.857143 2.8749445 11.941555 -6.5591327 <0.0001
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O
demoaeg
6:44 PM
10/2/2019

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