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test the hypothesis of no difference betn population means

SPSS computation and interpretation (T-Test)

Rental card gasoline prices per gallon were sampled at eight major airports. Data for Hertz and National car rental companies follow:

Airport Hertz National

Boston Logan 1.55 1.56
Chicago O'Hare 1.62 1.59
Los Angeles 1.72 1.78
Miami 1.65 1.49
New York (JFK) 1.72 1.51
New York (LaGuardia) 1.67 1.50
Orange County, CA 1.68 1.77
Washington (Dulles) 1.52 1.41

a. Use α = .05 to test the hypothesis of no difference between the population mean prices per gallon for the two companies.
b. Develop a 90% confidence interval estimate of the difference between the two population means (specify the null hypothesis and alternative hypothesis)
c. Develop a bar chart for these data

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