28. The article Effect of Internal Gas Pressure on the Compression Strength of Beverage Cans and Plastic Bottles (J. Testing Eval., 1993: 129—131) includes the accompanying data on compression strength (lb)

for a sample of 12-oz aluminum cans lled with strawberry drink and another sample lled with cola. Does the data suggest that the extra carbonation of cola results in a higher average compression strength? Base your answer on a P-value. What assumptions are necessary for your analysis?

Sample Sample Sample Beverage Size Mean SD Strawberry drink 15 540 21 Cola 15 554 15