basic statistics problem about probability.

Data on the impact strength (in foot-pounds) of two kinds of packaging material are given below. Assume two normal populations, independent random samples, and equal variances for the two populations. Use this information for problems for 30 to 32. Packaging Sample Sample Material Impact Strength Mean St. Dev. A 1.25 1.16 1.33 1.15 1.23 1.22 1.32 1.237 0.0702 B 1.12 1.01 0.97 1.05 0.94 1.02 0.98 1.06 1.019 0.0574