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5 Steps in hypothesis Testing

Need help working my way through the rest of the 5 steps with the information given.
The null hypothesis is the average miles per gallon of fuel used in the Toyota Highlander hybrid vehicle, ?h is higher to equal to than that of a Toyota Hylander standard eight cyclinder, ?8. The alternative hypothesis is the average miles per gallon of fuel used is lower in the Toyota Hylander hybrid vehicle, ?h than that of a Toyota Hylander standard eight cylinder, ?h8. This would be expressed in the statistical equations below:
H0: ?h ? ?8
HA: ?h < ?8
This data will be tested with a significance level of .05 in order to ensure 95% confidence in the accepted hypothesis assuming a normal distribution of the data.

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