In r coding for statistics ( please do not forget the syntax)

This file contains the composite success rate of 48 different experiments, 24 conducted with just the test subject and the original researcher, and 24 with an observer present. All experiments reported in this sample were conducted on either test subjects A or B, two of the researcher's most 'talented' test subjects.

Ignoring any differences between the two subjects, that is, considering both subjects together as one, does the presence of an observer make a difference in test subject average success rate? What is the P value which you used as a basis for answering question 2.5? Please answer to 4 digits.

the excel file

subject	Trials_before_observer	Trials_with_observer
SubjectA	0.334899	0.202202
SubjectA	0.260702	0.199741
SubjectA	0.340055	0.198841
SubjectA	0.261472	0.202582
SubjectA	0.31731	0.195086
SubjectA	0.259314	0.203616
SubjectA	0.323056	0.197986
SubjectA	0.294657	0.204668
SubjectA	0.334236	0.202333
SubjectA	0.335996	0.204178
SubjectA	0.261451	0.196089
SubjectA	0.303034	0.202161
SubjectB	0.235279	0.19707
SubjectB	0.268943	0.204998
SubjectB	0.272538	0.199578
SubjectB	0.303447	0.203615
SubjectB	0.297265	0.197178
SubjectB	0.3079	0.19691
SubjectB	0.314711	0.200415
SubjectB	0.280338	0.198911
SubjectB	0.318659	0.202097
SubjectB	0.248869	0.203604
SubjectB	0.246873	0.199047
SubjectB	0.322606	0.197015