How would you solve the below?

An efficiency manager is evaluating the quality of sportswear manufactured by two brands - A and B. She wishes to test whether the difference between the mean number of faulty pieces supplied by the brands in each of their consignments is zero or not. For this, the manager collects data from the two brands. Suppose that the mean number of faulty pieces supplied by the brands are independent of each other.

Let n denote the number of consignments for which the data was collected, x denote the sample mean of the number of faulty pieces supplied per consignment by each brand, and s denote the sample standard deviation in the number of faulty pieces supplied per consignment by each brand. The given table shows the data collected.

Brand	n	x	s
A	120	15.21	11.2
B	85	10.11	14.1

The standard error of the difference between the sample means is?

The t-statistic for testing the null hypothesis is?

All rounded to two decimal places.