4. (12 pts.) A study includes the accompanying data on compression strength (lb) for a sample of 12-02 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? Assuming equal population variances, write the hypotheses and run an appropriate test to draw the conclusion. (Hint: the pooled variance Sp = (n-1)s+(m1)s,.) n+m2 Beverage Sample Size Sample Sample St. Mean Dev. Strawberry drink 15 546 21 Cola 1 5 560 1 5