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Data Set/Description 
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Example  Independent and Dependent tTest data
In this example, when tested using an Independent tTest, there is no difference. However, when testing using a Dependent tTest, the difference is significant. The reason is attributed to how error variance is calculated.  housew1  Jul 3, 2019  746B  24 
D1.6
Dataset: airline_costs.dat
Source: J.W. Proctor and J.S. Duncan (1954). "A Regression Analysis
of Airline Costs," Journal of Air Law and Commerce, Vol.21, #3, pp.282292.
Description: Regression relating Operating Costs per revenue tonmile to 7 factors: length of flight, speed of plane, daily flight time per aircraft, population served, tonmile load factor, available tons per aircraft mile, and firms net assets. Regression based on natural logarithms of all factors, except load factor. Load factor and available tons (capacity) for Northeast Airlines was imputed from summary calculations.
Variables/columns
Airline 120
Length of flight (miles) 2228
L_Group (inserted) Long (>175), Med (>60), Short (<69)
Speed of Plane (miles per hour) 3036
Daily Flight Time per plane (hours) 3844
Population served (1000s) 4652
Total Operating Cost (cents per revenue tonmile) 5460
Revenue Tons per Aircraft mile 6268
TonMile load factor (proportion) 7076
Available Capacity (Tons per mile) 7884
Total Assets ($100,000s) 8692
Investments and Special Funds ($100,000s) 94100
Adjusted Assets ($100,000s) 102108  housew1  Jul 3, 2019  2KB  62 
D5.3
Data for discussion. OLD = Old material; NEW = New composite material. Discover how you would test the hypothesis using StatCrunch.  housew1  Jun 16, 2019  605B  26 
D4.3
Population A, mean=36, sd=4. Population B = 44 (single value)
Explore how to compute this test using StatCrunch.  housew1  Jun 16, 2019  46KB  36 
D2.4
Data set with a mean =40 and SD = 10.
Explore how zscores were computed.
You will see [8] above the StatCrunch button. Explore the tables visuals, and calculated columns (Zscore and DATA2).  housew1  Jun 16, 2019  53KB  52  A4.2  housew1  Jun 15, 2019  66B  1  A2.2
Assignment 2.2  housew1  Jun 15, 2019  282B  4  A1.5  housew1  Apr 28, 2019  305B  6 

