''Conduct a test to determine if on average there are more pieces produced on a day when products of type A are produced than on a day when product type D is produced. Write down the value of the test statistic and the conclusion of the test. Also conduct a test to conclude if on average there are more pieces produced when the manager is present than on a day when the manager is not present. Again write down the value of the test statistic and the conclusion of the test. Use α=2.5%. ''

Which test should be used for SPSS to conduct this research?