One stat question:

The numbers of blocked intrusion attempts per day during two weeks were 56, 47, 49, 37, 38, 60, 50, 43, 43, 59, 50, 56, 54, 58. After a change of firewall settings the numbers during the next 20 days are 53, 21, 32, 49, 45, 38, 44, 33, 32, 43, 53, 46, 36, 48, 39, 35, 37, 36, 39, 45. Can we claim a significant reduction in the rate of intrusion attempts? The number of intrusion attempts per day is approximately normally distributed. Compute p-values and state your conclusions under the assumption of equal variances and without it. Does this assumption make a difference