The article “Urban Battery Litter” cited in Example 8.14 gave the following summary data...

The article “Urban Battery Litter” cited in Example 8.14 gave the following summary data on zinc mass (g) for two different brands of size D batteries:

Assuming that both zinc mass distributions are at least approximately normal, carry out a test at significance level .05 using the P-value approach to decide whether true average zinc mass is different for the two types of batteries.