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Need Help with these Math Stats problem. I have attached the math sheet and the answer sheet.

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Need Help with these Math Stats problem. I have attached the math sheet and the answer sheet.
Answered Same Day May 28, 2021

Solution

Mohd answered on May 29 2021
143 Votes
1.) ta/2 ,8 : 3.55          
C.I: [-250.27, 21.39]
Conclusion:
1.2) H 0 : μa=μb Prep course has no effect on score or mean difference is not negative.
H1: μa≠μb Prep course has effect on score or mean difference is negative. ...
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