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Carbon emissions are being tested for 2 brands of cars. 53 cars of brand A emitted...

Carbon emissions are being tested for 2 brands of cars. 53 cars of brand A emitted an average of 435 grams per mile with a standard deviation of 6.8 grams per mile. 45 cars of brand B emitted an average 430 grams per mile with a standard deviation of 8.6 grams per mile.
a) Find the 95% confidence interval of the difference between emissions of the 2 brands
b) Can you conclude brand A has higher emissions at 1% significance than brand B? What is the p-value for this test?

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